1 /*
2 * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the Computer Systems
16 * Engineering Group at Lawrence Berkeley Laboratory.
17 * 4. Neither the name of the University nor of the Laboratory may be used
18 * to endorse or promote products derived from this software without
19 * specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #ifdef HAVE_CONFIG_H
35 #include <config.h>
36 #endif
37
38 #include <pcap-types.h>
39 #ifndef _WIN32
40 #include <sys/param.h>
41 #ifndef MSDOS
42 #include <sys/file.h>
43 #endif
44 #include <sys/ioctl.h>
45 #include <sys/socket.h>
46 #ifdef HAVE_SYS_SOCKIO_H
47 #include <sys/sockio.h>
48 #endif
49
50 struct mbuf; /* Squelch compiler warnings on some platforms for */
51 struct rtentry; /* declarations in <net/if.h> */
52 #include <net/if.h>
53 #include <netinet/in.h>
54 #endif /* _WIN32 */
55
56 #include <stdio.h>
57 #include <stdlib.h>
58 #include <string.h>
59 #if !defined(_MSC_VER) && !defined(__BORLANDC__) && !defined(__MINGW32__)
60 #include <unistd.h>
61 #endif
62 #include <fcntl.h>
63 #include <errno.h>
64 #include <limits.h>
65
66 #include "diag-control.h"
67
68 #ifdef HAVE_OS_PROTO_H
69 #include "os-proto.h"
70 #endif
71
72 #ifdef MSDOS
73 #include "pcap-dos.h"
74 #endif
75
76 #include "pcap-int.h"
77
78 #include "optimize.h"
79
80 #ifdef HAVE_DAG_API
81 #include "pcap-dag.h"
82 #endif /* HAVE_DAG_API */
83
84 #ifdef HAVE_SEPTEL_API
85 #include "pcap-septel.h"
86 #endif /* HAVE_SEPTEL_API */
87
88 #ifdef HAVE_SNF_API
89 #include "pcap-snf.h"
90 #endif /* HAVE_SNF_API */
91
92 #ifdef HAVE_TC_API
93 #include "pcap-tc.h"
94 #endif /* HAVE_TC_API */
95
96 #ifdef PCAP_SUPPORT_LINUX_USBMON
97 #include "pcap-usb-linux.h"
98 #endif
99
100 #ifdef PCAP_SUPPORT_BT
101 #include "pcap-bt-linux.h"
102 #endif
103
104 #ifdef PCAP_SUPPORT_BT_MONITOR
105 #include "pcap-bt-monitor-linux.h"
106 #endif
107
108 #ifdef PCAP_SUPPORT_NETFILTER
109 #include "pcap-netfilter-linux.h"
110 #endif
111
112 #ifdef PCAP_SUPPORT_NETMAP
113 #include "pcap-netmap.h"
114 #endif
115
116 #ifdef PCAP_SUPPORT_DBUS
117 #include "pcap-dbus.h"
118 #endif
119
120 #ifdef PCAP_SUPPORT_RDMASNIFF
121 #include "pcap-rdmasniff.h"
122 #endif
123
124 #ifdef PCAP_SUPPORT_DPDK
125 #include "pcap-dpdk.h"
126 #endif
127
128 #ifdef HAVE_AIRPCAP_API
129 #include "pcap-airpcap.h"
130 #endif
131
132 #ifdef _WIN32
133 /*
134 * DllMain(), required when built as a Windows DLL.
135 *
136 * To quote the WSAStartup() documentation:
137 *
138 * The WSAStartup function typically leads to protocol-specific helper
139 * DLLs being loaded. As a result, the WSAStartup function should not
140 * be called from the DllMain function in a application DLL. This can
141 * potentially cause deadlocks.
142 *
143 * and the WSACleanup() documentation:
144 *
145 * The WSACleanup function typically leads to protocol-specific helper
146 * DLLs being unloaded. As a result, the WSACleanup function should not
147 * be called from the DllMain function in a application DLL. This can
148 * potentially cause deadlocks.
149 *
150 * So we don't initialize Winsock here. pcap_init() should be called
151 * to initialize pcap on both UN*X and Windows; it will initialize
152 * Winsock on Windows. (It will also be initialized as needed if
153 * pcap_init() hasn't been called.)
154 */
DllMain(HANDLE hinstDLL _U_,DWORD dwReason _U_,LPVOID lpvReserved _U_)155 BOOL WINAPI DllMain(
156 HANDLE hinstDLL _U_,
157 DWORD dwReason _U_,
158 LPVOID lpvReserved _U_
159 )
160 {
161 return (TRUE);
162 }
163
164 /*
165 * Start Winsock.
166 * Internal routine.
167 */
168 static int
internal_wsockinit(char * errbuf)169 internal_wsockinit(char *errbuf)
170 {
171 WORD wVersionRequested;
172 WSADATA wsaData;
173 static int err = -1;
174 static int done = 0;
175 int status;
176
177 if (done)
178 return (err);
179
180 /*
181 * Versions of Windows that don't support Winsock 2.2 are
182 * too old for us.
183 */
184 wVersionRequested = MAKEWORD(2, 2);
185 status = WSAStartup(wVersionRequested, &wsaData);
186 done = 1;
187 if (status != 0) {
188 if (errbuf != NULL) {
189 pcap_fmt_errmsg_for_win32_err(errbuf, PCAP_ERRBUF_SIZE,
190 status, "WSAStartup() failed");
191 }
192 return (err);
193 }
194 atexit ((void(*)(void))WSACleanup);
195 err = 0;
196 return (err);
197 }
198
199 /*
200 * Exported in case some applications using WinPcap/Npcap called it,
201 * even though it wasn't exported.
202 */
203 int
wsockinit(void)204 wsockinit(void)
205 {
206 return (internal_wsockinit(NULL));
207 }
208
209 /*
210 * This is the exported function; new programs should call this.
211 * *Newer* programs should call pcap_init().
212 */
213 int
pcap_wsockinit(void)214 pcap_wsockinit(void)
215 {
216 return (internal_wsockinit(NULL));
217 }
218 #endif /* _WIN32 */
219
220 /*
221 * Do whatever initialization is needed for libpcap.
222 *
223 * The argument specifies whether we use the local code page or UTF-8
224 * for strings; on UN*X, we just assume UTF-8 in places where the encoding
225 * would matter, whereas, on Windows, we use the local code page for
226 * PCAP_CHAR_ENC_LOCAL and UTF-8 for PCAP_CHAR_ENC_UTF_8.
227 *
228 * On Windows, we also disable the hack in pcap_create() to deal with
229 * being handed UTF-16 strings, because if the user calls this they're
230 * explicitly declaring that they will either be passing local code
231 * page strings or UTF-8 strings, so we don't need to allow UTF-16LE
232 * strings to be passed. For good measure, on Windows *and* UN*X,
233 * we disable pcap_lookupdev(), to prevent anybody from even
234 * *trying* to pass the result of pcap_lookupdev() - which might be
235 * UTF-16LE on Windows, for ugly compatibility reasons - to pcap_create()
236 * or pcap_open_live() or pcap_open().
237 *
238 * Returns 0 on success, -1 on error.
239 */
240 int pcap_new_api; /* pcap_lookupdev() always fails */
241 int pcap_utf_8_mode; /* Strings should be in UTF-8. */
242
243 int
pcap_init(unsigned int opts,char * errbuf)244 pcap_init(unsigned int opts, char *errbuf)
245 {
246 static int initialized;
247
248 /*
249 * Don't allow multiple calls that set different modes; that
250 * may mean a library is initializing pcap in one mode and
251 * a program using that library, or another library used by
252 * that program, is initializing it in another mode.
253 */
254 switch (opts) {
255
256 case PCAP_CHAR_ENC_LOCAL:
257 /* Leave "UTF-8 mode" off. */
258 if (initialized) {
259 if (pcap_utf_8_mode) {
260 snprintf(errbuf, PCAP_ERRBUF_SIZE,
261 "Multiple pcap_init calls with different character encodings");
262 return (-1);
263 }
264 }
265 break;
266
267 case PCAP_CHAR_ENC_UTF_8:
268 /* Turn on "UTF-8 mode". */
269 if (initialized) {
270 if (!pcap_utf_8_mode) {
271 snprintf(errbuf, PCAP_ERRBUF_SIZE,
272 "Multiple pcap_init calls with different character encodings");
273 return (-1);
274 }
275 }
276 pcap_utf_8_mode = 1;
277 break;
278
279 default:
280 snprintf(errbuf, PCAP_ERRBUF_SIZE, "Unknown options specified");
281 return (-1);
282 }
283
284 /*
285 * Turn the appropriate mode on for error messages; those routines
286 * are also used in rpcapd, which has no access to pcap's internal
287 * UTF-8 mode flag, so we have to call a routine to set its
288 * UTF-8 mode flag.
289 */
290 pcap_fmt_set_encoding(opts);
291
292 if (initialized) {
293 /*
294 * Nothing more to do; for example, on Windows, we've
295 * already initialized Winsock.
296 */
297 return (0);
298 }
299
300 #ifdef _WIN32
301 /*
302 * Now set up Winsock.
303 */
304 if (internal_wsockinit(errbuf) == -1) {
305 /* Failed. */
306 return (-1);
307 }
308 #endif
309
310 /*
311 * We're done.
312 */
313 initialized = 1;
314 pcap_new_api = 1;
315 return (0);
316 }
317
318 /*
319 * String containing the library version.
320 * Not explicitly exported via a header file - the right API to use
321 * is pcap_lib_version() - but some programs included it, so we
322 * provide it.
323 *
324 * We declare it here, right before defining it, to squelch any
325 * warnings we might get from compilers about the lack of a
326 * declaration.
327 */
328 PCAP_API char pcap_version[];
329 PCAP_API_DEF char pcap_version[] = PACKAGE_VERSION;
330
331 static void
pcap_set_not_initialized_message(pcap_t * pcap)332 pcap_set_not_initialized_message(pcap_t *pcap)
333 {
334 if (pcap->activated) {
335 /* A module probably forgot to set the function pointer */
336 (void)snprintf(pcap->errbuf, sizeof(pcap->errbuf),
337 "This operation isn't properly handled by that device");
338 return;
339 }
340 /* in case the caller doesn't check for PCAP_ERROR_NOT_ACTIVATED */
341 (void)snprintf(pcap->errbuf, sizeof(pcap->errbuf),
342 "This handle hasn't been activated yet");
343 }
344
345 static int
pcap_read_not_initialized(pcap_t * pcap,int cnt _U_,pcap_handler callback _U_,u_char * user _U_)346 pcap_read_not_initialized(pcap_t *pcap, int cnt _U_, pcap_handler callback _U_,
347 u_char *user _U_)
348 {
349 pcap_set_not_initialized_message(pcap);
350 /* this means 'not initialized' */
351 return (PCAP_ERROR_NOT_ACTIVATED);
352 }
353
354 static int
pcap_inject_not_initialized(pcap_t * pcap,const void * buf _U_,int size _U_)355 pcap_inject_not_initialized(pcap_t *pcap, const void * buf _U_, int size _U_)
356 {
357 pcap_set_not_initialized_message(pcap);
358 /* this means 'not initialized' */
359 return (PCAP_ERROR_NOT_ACTIVATED);
360 }
361
362 static int
pcap_setfilter_not_initialized(pcap_t * pcap,struct bpf_program * fp _U_)363 pcap_setfilter_not_initialized(pcap_t *pcap, struct bpf_program *fp _U_)
364 {
365 pcap_set_not_initialized_message(pcap);
366 /* this means 'not initialized' */
367 return (PCAP_ERROR_NOT_ACTIVATED);
368 }
369
370 static int
pcap_setdirection_not_initialized(pcap_t * pcap,pcap_direction_t d _U_)371 pcap_setdirection_not_initialized(pcap_t *pcap, pcap_direction_t d _U_)
372 {
373 pcap_set_not_initialized_message(pcap);
374 /* this means 'not initialized' */
375 return (PCAP_ERROR_NOT_ACTIVATED);
376 }
377
378 static int
pcap_set_datalink_not_initialized(pcap_t * pcap,int dlt _U_)379 pcap_set_datalink_not_initialized(pcap_t *pcap, int dlt _U_)
380 {
381 pcap_set_not_initialized_message(pcap);
382 /* this means 'not initialized' */
383 return (PCAP_ERROR_NOT_ACTIVATED);
384 }
385
386 static int
pcap_getnonblock_not_initialized(pcap_t * pcap)387 pcap_getnonblock_not_initialized(pcap_t *pcap)
388 {
389 pcap_set_not_initialized_message(pcap);
390 /* this means 'not initialized' */
391 return (PCAP_ERROR_NOT_ACTIVATED);
392 }
393
394 static int
pcap_stats_not_initialized(pcap_t * pcap,struct pcap_stat * ps _U_)395 pcap_stats_not_initialized(pcap_t *pcap, struct pcap_stat *ps _U_)
396 {
397 pcap_set_not_initialized_message(pcap);
398 /* this means 'not initialized' */
399 return (PCAP_ERROR_NOT_ACTIVATED);
400 }
401
402 #ifdef _WIN32
403 static struct pcap_stat *
pcap_stats_ex_not_initialized(pcap_t * pcap,int * pcap_stat_size _U_)404 pcap_stats_ex_not_initialized(pcap_t *pcap, int *pcap_stat_size _U_)
405 {
406 pcap_set_not_initialized_message(pcap);
407 return (NULL);
408 }
409
410 static int
pcap_setbuff_not_initialized(pcap_t * pcap,int dim _U_)411 pcap_setbuff_not_initialized(pcap_t *pcap, int dim _U_)
412 {
413 pcap_set_not_initialized_message(pcap);
414 /* this means 'not initialized' */
415 return (PCAP_ERROR_NOT_ACTIVATED);
416 }
417
418 static int
pcap_setmode_not_initialized(pcap_t * pcap,int mode _U_)419 pcap_setmode_not_initialized(pcap_t *pcap, int mode _U_)
420 {
421 pcap_set_not_initialized_message(pcap);
422 /* this means 'not initialized' */
423 return (PCAP_ERROR_NOT_ACTIVATED);
424 }
425
426 static int
pcap_setmintocopy_not_initialized(pcap_t * pcap,int size _U_)427 pcap_setmintocopy_not_initialized(pcap_t *pcap, int size _U_)
428 {
429 pcap_set_not_initialized_message(pcap);
430 /* this means 'not initialized' */
431 return (PCAP_ERROR_NOT_ACTIVATED);
432 }
433
434 static HANDLE
pcap_getevent_not_initialized(pcap_t * pcap)435 pcap_getevent_not_initialized(pcap_t *pcap)
436 {
437 pcap_set_not_initialized_message(pcap);
438 return (INVALID_HANDLE_VALUE);
439 }
440
441 static int
pcap_oid_get_request_not_initialized(pcap_t * pcap,bpf_u_int32 oid _U_,void * data _U_,size_t * lenp _U_)442 pcap_oid_get_request_not_initialized(pcap_t *pcap, bpf_u_int32 oid _U_,
443 void *data _U_, size_t *lenp _U_)
444 {
445 pcap_set_not_initialized_message(pcap);
446 return (PCAP_ERROR_NOT_ACTIVATED);
447 }
448
449 static int
pcap_oid_set_request_not_initialized(pcap_t * pcap,bpf_u_int32 oid _U_,const void * data _U_,size_t * lenp _U_)450 pcap_oid_set_request_not_initialized(pcap_t *pcap, bpf_u_int32 oid _U_,
451 const void *data _U_, size_t *lenp _U_)
452 {
453 pcap_set_not_initialized_message(pcap);
454 return (PCAP_ERROR_NOT_ACTIVATED);
455 }
456
457 static u_int
pcap_sendqueue_transmit_not_initialized(pcap_t * pcap,pcap_send_queue * queue _U_,int sync _U_)458 pcap_sendqueue_transmit_not_initialized(pcap_t *pcap, pcap_send_queue* queue _U_,
459 int sync _U_)
460 {
461 pcap_set_not_initialized_message(pcap);
462 return (0);
463 }
464
465 static int
pcap_setuserbuffer_not_initialized(pcap_t * pcap,int size _U_)466 pcap_setuserbuffer_not_initialized(pcap_t *pcap, int size _U_)
467 {
468 pcap_set_not_initialized_message(pcap);
469 return (PCAP_ERROR_NOT_ACTIVATED);
470 }
471
472 static int
pcap_live_dump_not_initialized(pcap_t * pcap,char * filename _U_,int maxsize _U_,int maxpacks _U_)473 pcap_live_dump_not_initialized(pcap_t *pcap, char *filename _U_, int maxsize _U_,
474 int maxpacks _U_)
475 {
476 pcap_set_not_initialized_message(pcap);
477 return (PCAP_ERROR_NOT_ACTIVATED);
478 }
479
480 static int
pcap_live_dump_ended_not_initialized(pcap_t * pcap,int sync _U_)481 pcap_live_dump_ended_not_initialized(pcap_t *pcap, int sync _U_)
482 {
483 pcap_set_not_initialized_message(pcap);
484 return (PCAP_ERROR_NOT_ACTIVATED);
485 }
486
487 static PAirpcapHandle
pcap_get_airpcap_handle_not_initialized(pcap_t * pcap)488 pcap_get_airpcap_handle_not_initialized(pcap_t *pcap)
489 {
490 pcap_set_not_initialized_message(pcap);
491 return (NULL);
492 }
493 #endif
494
495 /*
496 * Returns 1 if rfmon mode can be set on the pcap_t, 0 if it can't,
497 * a PCAP_ERROR value on an error.
498 */
499 int
pcap_can_set_rfmon(pcap_t * p)500 pcap_can_set_rfmon(pcap_t *p)
501 {
502 return (p->can_set_rfmon_op(p));
503 }
504
505 /*
506 * For systems where rfmon mode is never supported.
507 */
508 static int
pcap_cant_set_rfmon(pcap_t * p _U_)509 pcap_cant_set_rfmon(pcap_t *p _U_)
510 {
511 return (0);
512 }
513
514 /*
515 * Sets *tstamp_typesp to point to an array 1 or more supported time stamp
516 * types; the return value is the number of supported time stamp types.
517 * The list should be freed by a call to pcap_free_tstamp_types() when
518 * you're done with it.
519 *
520 * A return value of 0 means "you don't get a choice of time stamp type",
521 * in which case *tstamp_typesp is set to null.
522 *
523 * PCAP_ERROR is returned on error.
524 */
525 int
pcap_list_tstamp_types(pcap_t * p,int ** tstamp_typesp)526 pcap_list_tstamp_types(pcap_t *p, int **tstamp_typesp)
527 {
528 if (p->tstamp_type_count == 0) {
529 /*
530 * We don't support multiple time stamp types.
531 * That means the only type we support is PCAP_TSTAMP_HOST;
532 * set up a list containing only that type.
533 */
534 *tstamp_typesp = (int*)malloc(sizeof(**tstamp_typesp));
535 if (*tstamp_typesp == NULL) {
536 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
537 errno, "malloc");
538 return (PCAP_ERROR);
539 }
540 **tstamp_typesp = PCAP_TSTAMP_HOST;
541 return (1);
542 } else {
543 *tstamp_typesp = (int*)calloc(sizeof(**tstamp_typesp),
544 p->tstamp_type_count);
545 if (*tstamp_typesp == NULL) {
546 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
547 errno, "malloc");
548 return (PCAP_ERROR);
549 }
550 (void)memcpy(*tstamp_typesp, p->tstamp_type_list,
551 sizeof(**tstamp_typesp) * p->tstamp_type_count);
552 return (p->tstamp_type_count);
553 }
554 }
555
556 /*
557 * In Windows, you might have a library built with one version of the
558 * C runtime library and an application built with another version of
559 * the C runtime library, which means that the library might use one
560 * version of malloc() and free() and the application might use another
561 * version of malloc() and free(). If so, that means something
562 * allocated by the library cannot be freed by the application, so we
563 * need to have a pcap_free_tstamp_types() routine to free up the list
564 * allocated by pcap_list_tstamp_types(), even though it's just a wrapper
565 * around free().
566 */
567 void
pcap_free_tstamp_types(int * tstamp_type_list)568 pcap_free_tstamp_types(int *tstamp_type_list)
569 {
570 free(tstamp_type_list);
571 }
572
573 /*
574 * Default one-shot callback; overridden for capture types where the
575 * packet data cannot be guaranteed to be available after the callback
576 * returns, so that a copy must be made.
577 */
578 void
pcap_oneshot(u_char * user,const struct pcap_pkthdr * h,const u_char * pkt)579 pcap_oneshot(u_char *user, const struct pcap_pkthdr *h, const u_char *pkt)
580 {
581 struct oneshot_userdata *sp = (struct oneshot_userdata *)user;
582
583 *sp->hdr = *h;
584 *sp->pkt = pkt;
585 }
586
587 const u_char *
pcap_next(pcap_t * p,struct pcap_pkthdr * h)588 pcap_next(pcap_t *p, struct pcap_pkthdr *h)
589 {
590 struct oneshot_userdata s;
591 const u_char *pkt;
592
593 s.hdr = h;
594 s.pkt = &pkt;
595 s.pd = p;
596 if (pcap_dispatch(p, 1, p->oneshot_callback, (u_char *)&s) <= 0)
597 return (0);
598 return (pkt);
599 }
600
601 int
pcap_next_ex(pcap_t * p,struct pcap_pkthdr ** pkt_header,const u_char ** pkt_data)602 pcap_next_ex(pcap_t *p, struct pcap_pkthdr **pkt_header,
603 const u_char **pkt_data)
604 {
605 struct oneshot_userdata s;
606
607 s.hdr = &p->pcap_header;
608 s.pkt = pkt_data;
609 s.pd = p;
610
611 /* Saves a pointer to the packet headers */
612 *pkt_header= &p->pcap_header;
613
614 if (p->rfile != NULL) {
615 int status;
616
617 /* We are on an offline capture */
618 status = pcap_offline_read(p, 1, p->oneshot_callback,
619 (u_char *)&s);
620
621 /*
622 * Return codes for pcap_offline_read() are:
623 * - 0: EOF
624 * - -1: error
625 * - >1: OK
626 * The first one ('0') conflicts with the return code of
627 * 0 from pcap_read() meaning "no packets arrived before
628 * the timeout expired", so we map it to -2 so you can
629 * distinguish between an EOF from a savefile and a
630 * "no packets arrived before the timeout expired, try
631 * again" from a live capture.
632 */
633 if (status == 0)
634 return (-2);
635 else
636 return (status);
637 }
638
639 /*
640 * Return codes for pcap_read() are:
641 * - 0: timeout
642 * - -1: error
643 * - -2: loop was broken out of with pcap_breakloop()
644 * - >1: OK
645 * The first one ('0') conflicts with the return code of 0 from
646 * pcap_offline_read() meaning "end of file".
647 */
648 return (p->read_op(p, 1, p->oneshot_callback, (u_char *)&s));
649 }
650
651 /*
652 * Implementation of a pcap_if_list_t.
653 */
654 struct pcap_if_list {
655 pcap_if_t *beginning;
656 };
657
658 static struct capture_source_type {
659 int (*findalldevs_op)(pcap_if_list_t *, char *);
660 pcap_t *(*create_op)(const char *, char *, int *);
661 } capture_source_types[] = {
662 #ifdef HAVE_DAG_API
663 { dag_findalldevs, dag_create },
664 #endif
665 #ifdef HAVE_SEPTEL_API
666 { septel_findalldevs, septel_create },
667 #endif
668 #ifdef HAVE_SNF_API
669 { snf_findalldevs, snf_create },
670 #endif
671 #ifdef HAVE_TC_API
672 { TcFindAllDevs, TcCreate },
673 #endif
674 #ifdef PCAP_SUPPORT_BT
675 { bt_findalldevs, bt_create },
676 #endif
677 #ifdef PCAP_SUPPORT_BT_MONITOR
678 { bt_monitor_findalldevs, bt_monitor_create },
679 #endif
680 #ifdef PCAP_SUPPORT_LINUX_USBMON
681 { usb_findalldevs, usb_create },
682 #endif
683 #ifdef PCAP_SUPPORT_NETFILTER
684 { netfilter_findalldevs, netfilter_create },
685 #endif
686 #ifdef PCAP_SUPPORT_NETMAP
687 { pcap_netmap_findalldevs, pcap_netmap_create },
688 #endif
689 #ifdef PCAP_SUPPORT_DBUS
690 { dbus_findalldevs, dbus_create },
691 #endif
692 #ifdef PCAP_SUPPORT_RDMASNIFF
693 { rdmasniff_findalldevs, rdmasniff_create },
694 #endif
695 #ifdef PCAP_SUPPORT_DPDK
696 { pcap_dpdk_findalldevs, pcap_dpdk_create },
697 #endif
698 #ifdef HAVE_AIRPCAP_API
699 { airpcap_findalldevs, airpcap_create },
700 #endif
701 { NULL, NULL }
702 };
703
704 /*
705 * Get a list of all capture sources that are up and that we can open.
706 * Returns -1 on error, 0 otherwise.
707 * The list, as returned through "alldevsp", may be null if no interfaces
708 * were up and could be opened.
709 */
710 int
pcap_findalldevs(pcap_if_t ** alldevsp,char * errbuf)711 pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
712 {
713 size_t i;
714 pcap_if_list_t devlist;
715
716 /*
717 * Find all the local network interfaces on which we
718 * can capture.
719 */
720 devlist.beginning = NULL;
721 if (pcap_platform_finddevs(&devlist, errbuf) == -1) {
722 /*
723 * Failed - free all of the entries we were given
724 * before we failed.
725 */
726 if (devlist.beginning != NULL)
727 pcap_freealldevs(devlist.beginning);
728 *alldevsp = NULL;
729 return (-1);
730 }
731
732 /*
733 * Ask each of the non-local-network-interface capture
734 * source types what interfaces they have.
735 */
736 for (i = 0; capture_source_types[i].findalldevs_op != NULL; i++) {
737 if (capture_source_types[i].findalldevs_op(&devlist, errbuf) == -1) {
738 /*
739 * We had an error; free the list we've been
740 * constructing.
741 */
742 if (devlist.beginning != NULL)
743 pcap_freealldevs(devlist.beginning);
744 *alldevsp = NULL;
745 return (-1);
746 }
747 }
748
749 /*
750 * Return the first entry of the list of all devices.
751 */
752 *alldevsp = devlist.beginning;
753 return (0);
754 }
755
756 static struct sockaddr *
dup_sockaddr(struct sockaddr * sa,size_t sa_length)757 dup_sockaddr(struct sockaddr *sa, size_t sa_length)
758 {
759 struct sockaddr *newsa;
760
761 if ((newsa = malloc(sa_length)) == NULL)
762 return (NULL);
763 return (memcpy(newsa, sa, sa_length));
764 }
765
766 /*
767 * Construct a "figure of merit" for an interface, for use when sorting
768 * the list of interfaces, in which interfaces that are up are superior
769 * to interfaces that aren't up, interfaces that are up and running are
770 * superior to interfaces that are up but not running, and non-loopback
771 * interfaces that are up and running are superior to loopback interfaces,
772 * and interfaces with the same flags have a figure of merit that's higher
773 * the lower the instance number.
774 *
775 * The goal is to try to put the interfaces most likely to be useful for
776 * capture at the beginning of the list.
777 *
778 * The figure of merit, which is lower the "better" the interface is,
779 * has the uppermost bit set if the interface isn't running, the bit
780 * below that set if the interface isn't up, the bit below that
781 * set if the interface is a loopback interface, and the bit below
782 * that set if it's the "any" interface.
783 *
784 * Note: we don't sort by unit number because 1) not all interfaces have
785 * a unit number (systemd, for example, might assign interface names
786 * based on the interface's MAC address or on the physical location of
787 * the adapter's connector), and 2) if the name does end with a simple
788 * unit number, it's not a global property of the interface, it's only
789 * useful as a sort key for device names with the same prefix, so xyz0
790 * shouldn't necessarily sort before abc2. This means that interfaces
791 * with the same figure of merit will be sorted by the order in which
792 * the mechanism from which we're getting the interfaces supplies them.
793 */
794 static u_int
get_figure_of_merit(pcap_if_t * dev)795 get_figure_of_merit(pcap_if_t *dev)
796 {
797 u_int n;
798
799 n = 0;
800 if (!(dev->flags & PCAP_IF_RUNNING))
801 n |= 0x80000000;
802 if (!(dev->flags & PCAP_IF_UP))
803 n |= 0x40000000;
804
805 /*
806 * Give non-wireless interfaces that aren't disconnected a better
807 * figure of merit than interfaces that are disconnected, as
808 * "disconnected" should indicate that the interface isn't
809 * plugged into a network and thus won't give you any traffic.
810 *
811 * For wireless interfaces, it means "associated with a network",
812 * which we presume not to necessarily prevent capture, as you
813 * might run the adapter in some flavor of monitor mode.
814 */
815 if (!(dev->flags & PCAP_IF_WIRELESS) &&
816 (dev->flags & PCAP_IF_CONNECTION_STATUS) == PCAP_IF_CONNECTION_STATUS_DISCONNECTED)
817 n |= 0x20000000;
818
819 /*
820 * Sort loopback devices after non-loopback devices, *except* for
821 * disconnected devices.
822 */
823 if (dev->flags & PCAP_IF_LOOPBACK)
824 n |= 0x10000000;
825
826 /*
827 * Sort the "any" device before loopback and disconnected devices,
828 * but after all other devices.
829 */
830 if (strcmp(dev->name, "any") == 0)
831 n |= 0x08000000;
832
833 return (n);
834 }
835
836 #ifndef _WIN32
837 /*
838 * Try to get a description for a given device.
839 * Returns a mallocated description if it could and NULL if it couldn't.
840 *
841 * XXX - on FreeBSDs that support it, should it get the sysctl named
842 * "dev.{adapter family name}.{adapter unit}.%desc" to get a description
843 * of the adapter? Note that "dev.an.0.%desc" is "Aironet PC4500/PC4800"
844 * with my Cisco 350 card, so the name isn't entirely descriptive. The
845 * "dev.an.0.%pnpinfo" has a better description, although one might argue
846 * that the problem is really a driver bug - if it can find out that it's
847 * a Cisco 340 or 350, rather than an old Aironet card, it should use
848 * that in the description.
849 *
850 * Do NetBSD, DragonflyBSD, or OpenBSD support this as well? FreeBSD
851 * and OpenBSD let you get a description, but it's not generated by the OS,
852 * it's set with another ioctl that ifconfig supports; we use that to get
853 * a description in FreeBSD and OpenBSD, but if there is no such
854 * description available, it still might be nice to get some description
855 * string based on the device type or something such as that.
856 *
857 * In macOS, the System Configuration framework can apparently return
858 * names in 10.4 and later.
859 *
860 * It also appears that freedesktop.org's HAL offers an "info.product"
861 * string, but the HAL specification says it "should not be used in any
862 * UI" and "subsystem/capability specific properties" should be used
863 * instead and, in any case, I think HAL is being deprecated in
864 * favor of other stuff such as DeviceKit. DeviceKit doesn't appear
865 * to have any obvious product information for devices, but maybe
866 * I haven't looked hard enough.
867 *
868 * Using the System Configuration framework, or HAL, or DeviceKit, or
869 * whatever, would require that libpcap applications be linked with
870 * the frameworks/libraries in question. That shouldn't be a problem
871 * for programs linking with the shared version of libpcap (unless
872 * you're running on AIX - which I think is the only UN*X that doesn't
873 * support linking a shared library with other libraries on which it
874 * depends, and having an executable linked only with the first shared
875 * library automatically pick up the other libraries when started -
876 * and using HAL or whatever). Programs linked with the static
877 * version of libpcap would have to use pcap-config with the --static
878 * flag in order to get the right linker flags in order to pick up
879 * the additional libraries/frameworks; those programs need that anyway
880 * for libpcap 1.1 and beyond on Linux, as, by default, it requires
881 * -lnl.
882 *
883 * Do any other UN*Xes, or desktop environments support getting a
884 * description?
885 */
886 static char *
887 #ifdef SIOCGIFDESCR
get_if_description(const char * name)888 get_if_description(const char *name)
889 {
890 char *description = NULL;
891 int s;
892 struct ifreq ifrdesc;
893 #ifndef IFDESCRSIZE
894 size_t descrlen = 64;
895 #else
896 size_t descrlen = IFDESCRSIZE;
897 #endif /* IFDESCRSIZE */
898
899 /*
900 * Get the description for the interface.
901 */
902 memset(&ifrdesc, 0, sizeof ifrdesc);
903 pcap_strlcpy(ifrdesc.ifr_name, name, sizeof ifrdesc.ifr_name);
904 s = socket(AF_INET, SOCK_DGRAM, 0);
905 if (s >= 0) {
906 #ifdef __FreeBSD__
907 /*
908 * On FreeBSD, if the buffer isn't big enough for the
909 * description, the ioctl succeeds, but the description
910 * isn't copied, ifr_buffer.length is set to the description
911 * length, and ifr_buffer.buffer is set to NULL.
912 */
913 for (;;) {
914 free(description);
915 if ((description = malloc(descrlen)) != NULL) {
916 ifrdesc.ifr_buffer.buffer = description;
917 ifrdesc.ifr_buffer.length = descrlen;
918 if (ioctl(s, SIOCGIFDESCR, &ifrdesc) == 0) {
919 if (ifrdesc.ifr_buffer.buffer ==
920 description)
921 break;
922 else
923 descrlen = ifrdesc.ifr_buffer.length;
924 } else {
925 /*
926 * Failed to get interface description.
927 */
928 free(description);
929 description = NULL;
930 break;
931 }
932 } else
933 break;
934 }
935 #else /* __FreeBSD__ */
936 /*
937 * The only other OS that currently supports
938 * SIOCGIFDESCR is OpenBSD, and it has no way
939 * to get the description length - it's clamped
940 * to a maximum of IFDESCRSIZE.
941 */
942 if ((description = malloc(descrlen)) != NULL) {
943 ifrdesc.ifr_data = (caddr_t)description;
944 if (ioctl(s, SIOCGIFDESCR, &ifrdesc) != 0) {
945 /*
946 * Failed to get interface description.
947 */
948 free(description);
949 description = NULL;
950 }
951 }
952 #endif /* __FreeBSD__ */
953 close(s);
954 if (description != NULL && description[0] == '\0') {
955 /*
956 * Description is empty, so discard it.
957 */
958 free(description);
959 description = NULL;
960 }
961 }
962
963 #ifdef __FreeBSD__
964 /*
965 * For FreeBSD, if we didn't get a description, and this is
966 * a device with a name of the form usbusN, label it as a USB
967 * bus.
968 */
969 if (description == NULL) {
970 if (strncmp(name, "usbus", 5) == 0) {
971 /*
972 * OK, it begins with "usbus".
973 */
974 long busnum;
975 char *p;
976
977 errno = 0;
978 busnum = strtol(name + 5, &p, 10);
979 if (errno == 0 && p != name + 5 && *p == '\0' &&
980 busnum >= 0 && busnum <= INT_MAX) {
981 /*
982 * OK, it's a valid number that's not
983 * bigger than INT_MAX. Construct
984 * a description from it.
985 * (If that fails, we don't worry about
986 * it, we just return NULL.)
987 */
988 if (pcap_asprintf(&description,
989 "USB bus number %ld", busnum) == -1) {
990 /* Failed. */
991 description = NULL;
992 }
993 }
994 }
995 }
996 #endif
997 return (description);
998 #else /* SIOCGIFDESCR */
999 get_if_description(const char *name _U_)
1000 {
1001 return (NULL);
1002 #endif /* SIOCGIFDESCR */
1003 }
1004
1005 /*
1006 * Look for a given device in the specified list of devices.
1007 *
1008 * If we find it, return a pointer to its entry.
1009 *
1010 * If we don't find it, attempt to add an entry for it, with the specified
1011 * IFF_ flags and description, and, if that succeeds, return a pointer to
1012 * the new entry, otherwise return NULL and set errbuf to an error message.
1013 */
1014 pcap_if_t *
1015 find_or_add_if(pcap_if_list_t *devlistp, const char *name,
1016 bpf_u_int32 if_flags, get_if_flags_func get_flags_func, char *errbuf)
1017 {
1018 bpf_u_int32 pcap_flags;
1019
1020 /*
1021 * Convert IFF_ flags to pcap flags.
1022 */
1023 pcap_flags = 0;
1024 #ifdef IFF_LOOPBACK
1025 if (if_flags & IFF_LOOPBACK)
1026 pcap_flags |= PCAP_IF_LOOPBACK;
1027 #else
1028 /*
1029 * We don't have IFF_LOOPBACK, so look at the device name to
1030 * see if it looks like a loopback device.
1031 */
1032 if (name[0] == 'l' && name[1] == 'o' &&
1033 (PCAP_ISDIGIT(name[2]) || name[2] == '\0'))
1034 pcap_flags |= PCAP_IF_LOOPBACK;
1035 #endif
1036 #ifdef IFF_UP
1037 if (if_flags & IFF_UP)
1038 pcap_flags |= PCAP_IF_UP;
1039 #endif
1040 #ifdef IFF_RUNNING
1041 if (if_flags & IFF_RUNNING)
1042 pcap_flags |= PCAP_IF_RUNNING;
1043 #endif
1044
1045 /*
1046 * Attempt to find an entry for this device; if we don't find one,
1047 * attempt to add one.
1048 */
1049 return (find_or_add_dev(devlistp, name, pcap_flags,
1050 get_flags_func, get_if_description(name), errbuf));
1051 }
1052
1053 /*
1054 * Look for a given device in the specified list of devices.
1055 *
1056 * If we find it, then, if the specified address isn't null, add it to
1057 * the list of addresses for the device and return 0.
1058 *
1059 * If we don't find it, attempt to add an entry for it, with the specified
1060 * IFF_ flags and description, and, if that succeeds, add the specified
1061 * address to its list of addresses if that address is non-null, and
1062 * return 0, otherwise return -1 and set errbuf to an error message.
1063 *
1064 * (We can get called with a null address because we might get a list
1065 * of interface name/address combinations from the underlying OS, with
1066 * the address being absent in some cases, rather than a list of
1067 * interfaces with each interface having a list of addresses, so this
1068 * call may be the only call made to add to the list, and we want to
1069 * add interfaces even if they have no addresses.)
1070 */
1071 int
1072 add_addr_to_if(pcap_if_list_t *devlistp, const char *name,
1073 bpf_u_int32 if_flags, get_if_flags_func get_flags_func,
1074 struct sockaddr *addr, size_t addr_size,
1075 struct sockaddr *netmask, size_t netmask_size,
1076 struct sockaddr *broadaddr, size_t broadaddr_size,
1077 struct sockaddr *dstaddr, size_t dstaddr_size,
1078 char *errbuf)
1079 {
1080 pcap_if_t *curdev;
1081
1082 /*
1083 * Check whether the device exists and, if not, add it.
1084 */
1085 curdev = find_or_add_if(devlistp, name, if_flags, get_flags_func,
1086 errbuf);
1087 if (curdev == NULL) {
1088 /*
1089 * Error - give up.
1090 */
1091 return (-1);
1092 }
1093
1094 if (addr == NULL) {
1095 /*
1096 * There's no address to add; this entry just meant
1097 * "here's a new interface".
1098 */
1099 return (0);
1100 }
1101
1102 /*
1103 * "curdev" is an entry for this interface, and we have an
1104 * address for it; add an entry for that address to the
1105 * interface's list of addresses.
1106 */
1107 return (add_addr_to_dev(curdev, addr, addr_size, netmask,
1108 netmask_size, broadaddr, broadaddr_size, dstaddr,
1109 dstaddr_size, errbuf));
1110 }
1111 #endif /* _WIN32 */
1112
1113 /*
1114 * Add an entry to the list of addresses for an interface.
1115 * "curdev" is the entry for that interface.
1116 */
1117 int
1118 add_addr_to_dev(pcap_if_t *curdev,
1119 struct sockaddr *addr, size_t addr_size,
1120 struct sockaddr *netmask, size_t netmask_size,
1121 struct sockaddr *broadaddr, size_t broadaddr_size,
1122 struct sockaddr *dstaddr, size_t dstaddr_size,
1123 char *errbuf)
1124 {
1125 pcap_addr_t *curaddr, *prevaddr, *nextaddr;
1126
1127 /*
1128 * Allocate the new entry and fill it in.
1129 */
1130 curaddr = (pcap_addr_t *)malloc(sizeof(pcap_addr_t));
1131 if (curaddr == NULL) {
1132 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1133 errno, "malloc");
1134 return (-1);
1135 }
1136
1137 curaddr->next = NULL;
1138 if (addr != NULL && addr_size != 0) {
1139 curaddr->addr = (struct sockaddr *)dup_sockaddr(addr, addr_size);
1140 if (curaddr->addr == NULL) {
1141 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1142 errno, "malloc");
1143 free(curaddr);
1144 return (-1);
1145 }
1146 } else
1147 curaddr->addr = NULL;
1148
1149 if (netmask != NULL && netmask_size != 0) {
1150 curaddr->netmask = (struct sockaddr *)dup_sockaddr(netmask, netmask_size);
1151 if (curaddr->netmask == NULL) {
1152 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1153 errno, "malloc");
1154 if (curaddr->addr != NULL)
1155 free(curaddr->addr);
1156 free(curaddr);
1157 return (-1);
1158 }
1159 } else
1160 curaddr->netmask = NULL;
1161
1162 if (broadaddr != NULL && broadaddr_size != 0) {
1163 curaddr->broadaddr = (struct sockaddr *)dup_sockaddr(broadaddr, broadaddr_size);
1164 if (curaddr->broadaddr == NULL) {
1165 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1166 errno, "malloc");
1167 if (curaddr->netmask != NULL)
1168 free(curaddr->netmask);
1169 if (curaddr->addr != NULL)
1170 free(curaddr->addr);
1171 free(curaddr);
1172 return (-1);
1173 }
1174 } else
1175 curaddr->broadaddr = NULL;
1176
1177 if (dstaddr != NULL && dstaddr_size != 0) {
1178 curaddr->dstaddr = (struct sockaddr *)dup_sockaddr(dstaddr, dstaddr_size);
1179 if (curaddr->dstaddr == NULL) {
1180 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1181 errno, "malloc");
1182 if (curaddr->broadaddr != NULL)
1183 free(curaddr->broadaddr);
1184 if (curaddr->netmask != NULL)
1185 free(curaddr->netmask);
1186 if (curaddr->addr != NULL)
1187 free(curaddr->addr);
1188 free(curaddr);
1189 return (-1);
1190 }
1191 } else
1192 curaddr->dstaddr = NULL;
1193
1194 /*
1195 * Find the end of the list of addresses.
1196 */
1197 for (prevaddr = curdev->addresses; prevaddr != NULL; prevaddr = nextaddr) {
1198 nextaddr = prevaddr->next;
1199 if (nextaddr == NULL) {
1200 /*
1201 * This is the end of the list.
1202 */
1203 break;
1204 }
1205 }
1206
1207 if (prevaddr == NULL) {
1208 /*
1209 * The list was empty; this is the first member.
1210 */
1211 curdev->addresses = curaddr;
1212 } else {
1213 /*
1214 * "prevaddr" is the last member of the list; append
1215 * this member to it.
1216 */
1217 prevaddr->next = curaddr;
1218 }
1219
1220 return (0);
1221 }
1222
1223 /*
1224 * Look for a given device in the specified list of devices.
1225 *
1226 * If we find it, return 0 and set *curdev_ret to point to it.
1227 *
1228 * If we don't find it, attempt to add an entry for it, with the specified
1229 * flags and description, and, if that succeeds, return 0, otherwise
1230 * return -1 and set errbuf to an error message.
1231 */
1232 pcap_if_t *
1233 find_or_add_dev(pcap_if_list_t *devlistp, const char *name, bpf_u_int32 flags,
1234 get_if_flags_func get_flags_func, const char *description, char *errbuf)
1235 {
1236 pcap_if_t *curdev;
1237
1238 /*
1239 * Is there already an entry in the list for this device?
1240 */
1241 curdev = find_dev(devlistp, name);
1242 if (curdev != NULL) {
1243 /*
1244 * Yes, return it.
1245 */
1246 return (curdev);
1247 }
1248
1249 /*
1250 * No, we didn't find it.
1251 */
1252
1253 /*
1254 * Try to get additional flags for the device.
1255 */
1256 if ((*get_flags_func)(name, &flags, errbuf) == -1) {
1257 /*
1258 * Failed.
1259 */
1260 return (NULL);
1261 }
1262
1263 /*
1264 * Now, try to add it to the list of devices.
1265 */
1266 return (add_dev(devlistp, name, flags, description, errbuf));
1267 }
1268
1269 /*
1270 * Look for a given device in the specified list of devices, and return
1271 * the entry for it if we find it or NULL if we don't.
1272 */
1273 pcap_if_t *
1274 find_dev(pcap_if_list_t *devlistp, const char *name)
1275 {
1276 pcap_if_t *curdev;
1277
1278 /*
1279 * Is there an entry in the list for this device?
1280 */
1281 for (curdev = devlistp->beginning; curdev != NULL;
1282 curdev = curdev->next) {
1283 if (strcmp(name, curdev->name) == 0) {
1284 /*
1285 * We found it, so, yes, there is. No need to
1286 * add it. Provide the entry we found to our
1287 * caller.
1288 */
1289 return (curdev);
1290 }
1291 }
1292
1293 /*
1294 * No.
1295 */
1296 return (NULL);
1297 }
1298
1299 /*
1300 * Attempt to add an entry for a device, with the specified flags
1301 * and description, and, if that succeeds, return 0 and return a pointer
1302 * to the new entry, otherwise return NULL and set errbuf to an error
1303 * message.
1304 *
1305 * If we weren't given a description, try to get one.
1306 */
1307 pcap_if_t *
1308 add_dev(pcap_if_list_t *devlistp, const char *name, bpf_u_int32 flags,
1309 const char *description, char *errbuf)
1310 {
1311 pcap_if_t *curdev, *prevdev, *nextdev;
1312 u_int this_figure_of_merit, nextdev_figure_of_merit;
1313
1314 curdev = malloc(sizeof(pcap_if_t));
1315 if (curdev == NULL) {
1316 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1317 errno, "malloc");
1318 return (NULL);
1319 }
1320
1321 /*
1322 * Fill in the entry.
1323 */
1324 curdev->next = NULL;
1325 curdev->name = strdup(name);
1326 if (curdev->name == NULL) {
1327 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1328 errno, "malloc");
1329 free(curdev);
1330 return (NULL);
1331 }
1332 if (description == NULL) {
1333 /*
1334 * We weren't handed a description for the interface.
1335 */
1336 curdev->description = NULL;
1337 } else {
1338 /*
1339 * We were handed a description; make a copy.
1340 */
1341 curdev->description = strdup(description);
1342 if (curdev->description == NULL) {
1343 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1344 errno, "malloc");
1345 free(curdev->name);
1346 free(curdev);
1347 return (NULL);
1348 }
1349 }
1350 curdev->addresses = NULL; /* list starts out as empty */
1351 curdev->flags = flags;
1352
1353 /*
1354 * Add it to the list, in the appropriate location.
1355 * First, get the "figure of merit" for this interface.
1356 */
1357 this_figure_of_merit = get_figure_of_merit(curdev);
1358
1359 /*
1360 * Now look for the last interface with an figure of merit
1361 * less than or equal to the new interface's figure of merit.
1362 *
1363 * We start with "prevdev" being NULL, meaning we're before
1364 * the first element in the list.
1365 */
1366 prevdev = NULL;
1367 for (;;) {
1368 /*
1369 * Get the interface after this one.
1370 */
1371 if (prevdev == NULL) {
1372 /*
1373 * The next element is the first element.
1374 */
1375 nextdev = devlistp->beginning;
1376 } else
1377 nextdev = prevdev->next;
1378
1379 /*
1380 * Are we at the end of the list?
1381 */
1382 if (nextdev == NULL) {
1383 /*
1384 * Yes - we have to put the new entry after "prevdev".
1385 */
1386 break;
1387 }
1388
1389 /*
1390 * Is the new interface's figure of merit less
1391 * than the next interface's figure of merit,
1392 * meaning that the new interface is better
1393 * than the next interface?
1394 */
1395 nextdev_figure_of_merit = get_figure_of_merit(nextdev);
1396 if (this_figure_of_merit < nextdev_figure_of_merit) {
1397 /*
1398 * Yes - we should put the new entry
1399 * before "nextdev", i.e. after "prevdev".
1400 */
1401 break;
1402 }
1403
1404 prevdev = nextdev;
1405 }
1406
1407 /*
1408 * Insert before "nextdev".
1409 */
1410 curdev->next = nextdev;
1411
1412 /*
1413 * Insert after "prevdev" - unless "prevdev" is null,
1414 * in which case this is the first interface.
1415 */
1416 if (prevdev == NULL) {
1417 /*
1418 * This is the first interface. Make it
1419 * the first element in the list of devices.
1420 */
1421 devlistp->beginning = curdev;
1422 } else
1423 prevdev->next = curdev;
1424 return (curdev);
1425 }
1426
1427 /*
1428 * Free a list of interfaces.
1429 */
1430 void
1431 pcap_freealldevs(pcap_if_t *alldevs)
1432 {
1433 pcap_if_t *curdev, *nextdev;
1434 pcap_addr_t *curaddr, *nextaddr;
1435
1436 for (curdev = alldevs; curdev != NULL; curdev = nextdev) {
1437 nextdev = curdev->next;
1438
1439 /*
1440 * Free all addresses.
1441 */
1442 for (curaddr = curdev->addresses; curaddr != NULL; curaddr = nextaddr) {
1443 nextaddr = curaddr->next;
1444 if (curaddr->addr)
1445 free(curaddr->addr);
1446 if (curaddr->netmask)
1447 free(curaddr->netmask);
1448 if (curaddr->broadaddr)
1449 free(curaddr->broadaddr);
1450 if (curaddr->dstaddr)
1451 free(curaddr->dstaddr);
1452 free(curaddr);
1453 }
1454
1455 /*
1456 * Free the name string.
1457 */
1458 free(curdev->name);
1459
1460 /*
1461 * Free the description string, if any.
1462 */
1463 if (curdev->description != NULL)
1464 free(curdev->description);
1465
1466 /*
1467 * Free the interface.
1468 */
1469 free(curdev);
1470 }
1471 }
1472
1473 /*
1474 * pcap-npf.c has its own pcap_lookupdev(), for compatibility reasons, as
1475 * it actually returns the names of all interfaces, with a NUL separator
1476 * between them; some callers may depend on that.
1477 *
1478 * MS-DOS has its own pcap_lookupdev(), but that might be useful only
1479 * as an optimization.
1480 *
1481 * In all other cases, we just use pcap_findalldevs() to get a list of
1482 * devices, and pick from that list.
1483 */
1484 #if !defined(HAVE_PACKET32) && !defined(MSDOS)
1485 /*
1486 * Return the name of a network interface attached to the system, or NULL
1487 * if none can be found. The interface must be configured up; the
1488 * lowest unit number is preferred; loopback is ignored.
1489 */
1490 char *
1491 pcap_lookupdev(char *errbuf)
1492 {
1493 pcap_if_t *alldevs;
1494 #ifdef _WIN32
1495 /*
1496 * Windows - use the same size as the old WinPcap 3.1 code.
1497 * XXX - this is probably bigger than it needs to be.
1498 */
1499 #define IF_NAMESIZE 8192
1500 #else
1501 /*
1502 * UN*X - use the system's interface name size.
1503 * XXX - that might not be large enough for capture devices
1504 * that aren't regular network interfaces.
1505 */
1506 /* for old BSD systems, including bsdi3 */
1507 #ifndef IF_NAMESIZE
1508 #define IF_NAMESIZE IFNAMSIZ
1509 #endif
1510 #endif
1511 static char device[IF_NAMESIZE + 1];
1512 char *ret;
1513
1514 /*
1515 * We disable this in "new API" mode, because 1) in WinPcap/Npcap,
1516 * it may return UTF-16 strings, for backwards-compatibility
1517 * reasons, and we're also disabling the hack to make that work,
1518 * for not-going-past-the-end-of-a-string reasons, and 2) we
1519 * want its behavior to be consistent.
1520 *
1521 * In addition, it's not thread-safe, so we've marked it as
1522 * deprecated.
1523 */
1524 if (pcap_new_api) {
1525 snprintf(errbuf, PCAP_ERRBUF_SIZE,
1526 "pcap_lookupdev() is deprecated and is not supported in programs calling pcap_init()");
1527 return (NULL);
1528 }
1529
1530 if (pcap_findalldevs(&alldevs, errbuf) == -1)
1531 return (NULL);
1532
1533 if (alldevs == NULL || (alldevs->flags & PCAP_IF_LOOPBACK)) {
1534 /*
1535 * There are no devices on the list, or the first device
1536 * on the list is a loopback device, which means there
1537 * are no non-loopback devices on the list. This means
1538 * we can't return any device.
1539 *
1540 * XXX - why not return a loopback device? If we can't
1541 * capture on it, it won't be on the list, and if it's
1542 * on the list, there aren't any non-loopback devices,
1543 * so why not just supply it as the default device?
1544 */
1545 (void)pcap_strlcpy(errbuf, "no suitable device found",
1546 PCAP_ERRBUF_SIZE);
1547 ret = NULL;
1548 } else {
1549 /*
1550 * Return the name of the first device on the list.
1551 */
1552 (void)pcap_strlcpy(device, alldevs->name, sizeof(device));
1553 ret = device;
1554 }
1555
1556 pcap_freealldevs(alldevs);
1557 return (ret);
1558 }
1559 #endif /* !defined(HAVE_PACKET32) && !defined(MSDOS) */
1560
1561 #if !defined(_WIN32) && !defined(MSDOS)
1562 /*
1563 * We don't just fetch the entire list of devices, search for the
1564 * particular device, and use its first IPv4 address, as that's too
1565 * much work to get just one device's netmask.
1566 *
1567 * If we had an API to get attributes for a given device, we could
1568 * use that.
1569 */
1570 int
1571 pcap_lookupnet(const char *device, bpf_u_int32 *netp, bpf_u_int32 *maskp,
1572 char *errbuf)
1573 {
1574 register int fd;
1575 register struct sockaddr_in *sin4;
1576 struct ifreq ifr;
1577
1578 /*
1579 * The pseudo-device "any" listens on all interfaces and therefore
1580 * has the network address and -mask "0.0.0.0" therefore catching
1581 * all traffic. Using NULL for the interface is the same as "any".
1582 */
1583 if (!device || strcmp(device, "any") == 0
1584 #ifdef HAVE_DAG_API
1585 || strstr(device, "dag") != NULL
1586 #endif
1587 #ifdef HAVE_SEPTEL_API
1588 || strstr(device, "septel") != NULL
1589 #endif
1590 #ifdef PCAP_SUPPORT_BT
1591 || strstr(device, "bluetooth") != NULL
1592 #endif
1593 #ifdef PCAP_SUPPORT_LINUX_USBMON
1594 || strstr(device, "usbmon") != NULL
1595 #endif
1596 #ifdef HAVE_SNF_API
1597 || strstr(device, "snf") != NULL
1598 #endif
1599 #ifdef PCAP_SUPPORT_NETMAP
1600 || strncmp(device, "netmap:", 7) == 0
1601 || strncmp(device, "vale", 4) == 0
1602 #endif
1603 #ifdef PCAP_SUPPORT_DPDK
1604 || strncmp(device, "dpdk:", 5) == 0
1605 #endif
1606 ) {
1607 *netp = *maskp = 0;
1608 return 0;
1609 }
1610
1611 fd = socket(AF_INET, SOCK_DGRAM, 0);
1612 if (fd < 0) {
1613 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1614 errno, "socket");
1615 return (-1);
1616 }
1617 memset(&ifr, 0, sizeof(ifr));
1618 #ifdef linux
1619 /* XXX Work around Linux kernel bug */
1620 ifr.ifr_addr.sa_family = AF_INET;
1621 #endif
1622 (void)pcap_strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
1623 if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) {
1624 if (errno == EADDRNOTAVAIL) {
1625 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
1626 "%s: no IPv4 address assigned", device);
1627 } else {
1628 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1629 errno, "SIOCGIFADDR: %s", device);
1630 }
1631 (void)close(fd);
1632 return (-1);
1633 }
1634 sin4 = (struct sockaddr_in *)&ifr.ifr_addr;
1635 *netp = sin4->sin_addr.s_addr;
1636 memset(&ifr, 0, sizeof(ifr));
1637 #ifdef linux
1638 /* XXX Work around Linux kernel bug */
1639 ifr.ifr_addr.sa_family = AF_INET;
1640 #endif
1641 (void)pcap_strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
1642 if (ioctl(fd, SIOCGIFNETMASK, (char *)&ifr) < 0) {
1643 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1644 errno, "SIOCGIFNETMASK: %s", device);
1645 (void)close(fd);
1646 return (-1);
1647 }
1648 (void)close(fd);
1649 *maskp = sin4->sin_addr.s_addr;
1650 if (*maskp == 0) {
1651 if (IN_CLASSA(*netp))
1652 *maskp = IN_CLASSA_NET;
1653 else if (IN_CLASSB(*netp))
1654 *maskp = IN_CLASSB_NET;
1655 else if (IN_CLASSC(*netp))
1656 *maskp = IN_CLASSC_NET;
1657 else {
1658 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
1659 "inet class for 0x%x unknown", *netp);
1660 return (-1);
1661 }
1662 }
1663 *netp &= *maskp;
1664 return (0);
1665 }
1666 #endif /* !defined(_WIN32) && !defined(MSDOS) */
1667
1668 #ifdef ENABLE_REMOTE
1669 #include "pcap-rpcap.h"
1670
1671 /*
1672 * Extract a substring from a string.
1673 */
1674 static char *
1675 get_substring(const char *p, size_t len, char *ebuf)
1676 {
1677 char *token;
1678
1679 token = malloc(len + 1);
1680 if (token == NULL) {
1681 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1682 errno, "malloc");
1683 return (NULL);
1684 }
1685 memcpy(token, p, len);
1686 token[len] = '\0';
1687 return (token);
1688 }
1689
1690 /*
1691 * Parse a capture source that might be a URL.
1692 *
1693 * If the source is not a URL, *schemep, *userinfop, *hostp, and *portp
1694 * are set to NULL, *pathp is set to point to the source, and 0 is
1695 * returned.
1696 *
1697 * If source is a URL, and the URL refers to a local device (a special
1698 * case of rpcap:), *schemep, *userinfop, *hostp, and *portp are set
1699 * to NULL, *pathp is set to point to the device name, and 0 is returned.
1700 *
1701 * If source is a URL, and it's not a special case that refers to a local
1702 * device, and the parse succeeds:
1703 *
1704 * *schemep is set to point to an allocated string containing the scheme;
1705 *
1706 * if user information is present in the URL, *userinfop is set to point
1707 * to an allocated string containing the user information, otherwise
1708 * it's set to NULL;
1709 *
1710 * if host information is present in the URL, *hostp is set to point
1711 * to an allocated string containing the host information, otherwise
1712 * it's set to NULL;
1713 *
1714 * if a port number is present in the URL, *portp is set to point
1715 * to an allocated string containing the port number, otherwise
1716 * it's set to NULL;
1717 *
1718 * *pathp is set to point to an allocated string containing the
1719 * path;
1720 *
1721 * and 0 is returned.
1722 *
1723 * If the parse fails, ebuf is set to an error string, and -1 is returned.
1724 */
1725 static int
1726 pcap_parse_source(const char *source, char **schemep, char **userinfop,
1727 char **hostp, char **portp, char **pathp, char *ebuf)
1728 {
1729 char *colonp;
1730 size_t scheme_len;
1731 char *scheme;
1732 const char *endp;
1733 size_t authority_len;
1734 char *authority;
1735 char *parsep, *atsignp, *bracketp;
1736 char *userinfo, *host, *port, *path;
1737
1738 /*
1739 * Start out returning nothing.
1740 */
1741 *schemep = NULL;
1742 *userinfop = NULL;
1743 *hostp = NULL;
1744 *portp = NULL;
1745 *pathp = NULL;
1746
1747 /*
1748 * RFC 3986 says:
1749 *
1750 * URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
1751 *
1752 * hier-part = "//" authority path-abempty
1753 * / path-absolute
1754 * / path-rootless
1755 * / path-empty
1756 *
1757 * authority = [ userinfo "@" ] host [ ":" port ]
1758 *
1759 * userinfo = *( unreserved / pct-encoded / sub-delims / ":" )
1760 *
1761 * Step 1: look for the ":" at the end of the scheme.
1762 * A colon in the source is *NOT* sufficient to indicate that
1763 * this is a URL, as interface names on some platforms might
1764 * include colons (e.g., I think some Solaris interfaces
1765 * might).
1766 */
1767 colonp = strchr(source, ':');
1768 if (colonp == NULL) {
1769 /*
1770 * The source is the device to open.
1771 * Return a NULL pointer for the scheme, user information,
1772 * host, and port, and return the device as the path.
1773 */
1774 *pathp = strdup(source);
1775 if (*pathp == NULL) {
1776 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1777 errno, "malloc");
1778 return (-1);
1779 }
1780 return (0);
1781 }
1782
1783 /*
1784 * All schemes must have "//" after them, i.e. we only support
1785 * hier-part = "//" authority path-abempty, not
1786 * hier-part = path-absolute
1787 * hier-part = path-rootless
1788 * hier-part = path-empty
1789 *
1790 * We need that in order to distinguish between a local device
1791 * name that happens to contain a colon and a URI.
1792 */
1793 if (strncmp(colonp + 1, "//", 2) != 0) {
1794 /*
1795 * The source is the device to open.
1796 * Return a NULL pointer for the scheme, user information,
1797 * host, and port, and return the device as the path.
1798 */
1799 *pathp = strdup(source);
1800 if (*pathp == NULL) {
1801 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1802 errno, "malloc");
1803 return (-1);
1804 }
1805 return (0);
1806 }
1807
1808 /*
1809 * XXX - check whether the purported scheme could be a scheme?
1810 */
1811
1812 /*
1813 * OK, this looks like a URL.
1814 * Get the scheme.
1815 */
1816 scheme_len = colonp - source;
1817 scheme = malloc(scheme_len + 1);
1818 if (scheme == NULL) {
1819 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1820 errno, "malloc");
1821 return (-1);
1822 }
1823 memcpy(scheme, source, scheme_len);
1824 scheme[scheme_len] = '\0';
1825
1826 /*
1827 * Treat file: specially - take everything after file:// as
1828 * the pathname.
1829 */
1830 if (pcap_strcasecmp(scheme, "file") == 0) {
1831 *pathp = strdup(colonp + 3);
1832 if (*pathp == NULL) {
1833 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1834 errno, "malloc");
1835 free(scheme);
1836 return (-1);
1837 }
1838 *schemep = scheme;
1839 return (0);
1840 }
1841
1842 /*
1843 * The WinPcap documentation says you can specify a local
1844 * interface with "rpcap://{device}"; we special-case
1845 * that here. If the scheme is "rpcap", and there are
1846 * no slashes past the "//", we just return the device.
1847 *
1848 * XXX - %-escaping?
1849 */
1850 if ((pcap_strcasecmp(scheme, "rpcap") == 0 ||
1851 pcap_strcasecmp(scheme, "rpcaps") == 0) &&
1852 strchr(colonp + 3, '/') == NULL) {
1853 /*
1854 * Local device.
1855 *
1856 * Return a NULL pointer for the scheme, user information,
1857 * host, and port, and return the device as the path.
1858 */
1859 free(scheme);
1860 *pathp = strdup(colonp + 3);
1861 if (*pathp == NULL) {
1862 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1863 errno, "malloc");
1864 return (-1);
1865 }
1866 return (0);
1867 }
1868
1869 /*
1870 * OK, now start parsing the authority.
1871 * Get token, terminated with / or terminated at the end of
1872 * the string.
1873 */
1874 authority_len = strcspn(colonp + 3, "/");
1875 authority = get_substring(colonp + 3, authority_len, ebuf);
1876 if (authority == NULL) {
1877 /*
1878 * Error.
1879 */
1880 free(scheme);
1881 return (-1);
1882 }
1883 endp = colonp + 3 + authority_len;
1884
1885 /*
1886 * Now carve the authority field into its components.
1887 */
1888 parsep = authority;
1889
1890 /*
1891 * Is there a userinfo field?
1892 */
1893 atsignp = strchr(parsep, '@');
1894 if (atsignp != NULL) {
1895 /*
1896 * Yes.
1897 */
1898 size_t userinfo_len;
1899
1900 userinfo_len = atsignp - parsep;
1901 userinfo = get_substring(parsep, userinfo_len, ebuf);
1902 if (userinfo == NULL) {
1903 /*
1904 * Error.
1905 */
1906 free(authority);
1907 free(scheme);
1908 return (-1);
1909 }
1910 parsep = atsignp + 1;
1911 } else {
1912 /*
1913 * No.
1914 */
1915 userinfo = NULL;
1916 }
1917
1918 /*
1919 * Is there a host field?
1920 */
1921 if (*parsep == '\0') {
1922 /*
1923 * No; there's no host field or port field.
1924 */
1925 host = NULL;
1926 port = NULL;
1927 } else {
1928 /*
1929 * Yes.
1930 */
1931 size_t host_len;
1932
1933 /*
1934 * Is it an IP-literal?
1935 */
1936 if (*parsep == '[') {
1937 /*
1938 * Yes.
1939 * Treat verything up to the closing square
1940 * bracket as the IP-Literal; we don't worry
1941 * about whether it's a valid IPv6address or
1942 * IPvFuture (or an IPv4address, for that
1943 * matter, just in case we get handed a
1944 * URL with an IPv4 IP-Literal, of the sort
1945 * that pcap_createsrcstr() used to generate,
1946 * and that pcap_parsesrcstr(), in the original
1947 * WinPcap code, accepted).
1948 */
1949 bracketp = strchr(parsep, ']');
1950 if (bracketp == NULL) {
1951 /*
1952 * There's no closing square bracket.
1953 */
1954 snprintf(ebuf, PCAP_ERRBUF_SIZE,
1955 "IP-literal in URL doesn't end with ]");
1956 free(userinfo);
1957 free(authority);
1958 free(scheme);
1959 return (-1);
1960 }
1961 if (*(bracketp + 1) != '\0' &&
1962 *(bracketp + 1) != ':') {
1963 /*
1964 * There's extra crud after the
1965 * closing square bracketn.
1966 */
1967 snprintf(ebuf, PCAP_ERRBUF_SIZE,
1968 "Extra text after IP-literal in URL");
1969 free(userinfo);
1970 free(authority);
1971 free(scheme);
1972 return (-1);
1973 }
1974 host_len = (bracketp - 1) - parsep;
1975 host = get_substring(parsep + 1, host_len, ebuf);
1976 if (host == NULL) {
1977 /*
1978 * Error.
1979 */
1980 free(userinfo);
1981 free(authority);
1982 free(scheme);
1983 return (-1);
1984 }
1985 parsep = bracketp + 1;
1986 } else {
1987 /*
1988 * No.
1989 * Treat everything up to a : or the end of
1990 * the string as the host.
1991 */
1992 host_len = strcspn(parsep, ":");
1993 host = get_substring(parsep, host_len, ebuf);
1994 if (host == NULL) {
1995 /*
1996 * Error.
1997 */
1998 free(userinfo);
1999 free(authority);
2000 free(scheme);
2001 return (-1);
2002 }
2003 parsep = parsep + host_len;
2004 }
2005
2006 /*
2007 * Is there a port field?
2008 */
2009 if (*parsep == ':') {
2010 /*
2011 * Yes. It's the rest of the authority field.
2012 */
2013 size_t port_len;
2014
2015 parsep++;
2016 port_len = strlen(parsep);
2017 port = get_substring(parsep, port_len, ebuf);
2018 if (port == NULL) {
2019 /*
2020 * Error.
2021 */
2022 free(host);
2023 free(userinfo);
2024 free(authority);
2025 free(scheme);
2026 return (-1);
2027 }
2028 } else {
2029 /*
2030 * No.
2031 */
2032 port = NULL;
2033 }
2034 }
2035 free(authority);
2036
2037 /*
2038 * Everything else is the path. Strip off the leading /.
2039 */
2040 if (*endp == '\0')
2041 path = strdup("");
2042 else
2043 path = strdup(endp + 1);
2044 if (path == NULL) {
2045 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
2046 errno, "malloc");
2047 free(port);
2048 free(host);
2049 free(userinfo);
2050 free(scheme);
2051 return (-1);
2052 }
2053 *schemep = scheme;
2054 *userinfop = userinfo;
2055 *hostp = host;
2056 *portp = port;
2057 *pathp = path;
2058 return (0);
2059 }
2060
2061 int
2062 pcap_createsrcstr_ex(char *source, int type, const char *host, const char *port,
2063 const char *name, unsigned char uses_ssl, char *errbuf)
2064 {
2065 switch (type) {
2066
2067 case PCAP_SRC_FILE:
2068 pcap_strlcpy(source, PCAP_SRC_FILE_STRING, PCAP_BUF_SIZE);
2069 if (name != NULL && *name != '\0') {
2070 pcap_strlcat(source, name, PCAP_BUF_SIZE);
2071 return (0);
2072 } else {
2073 snprintf(errbuf, PCAP_ERRBUF_SIZE,
2074 "The file name cannot be NULL.");
2075 return (-1);
2076 }
2077
2078 case PCAP_SRC_IFREMOTE:
2079 pcap_strlcpy(source,
2080 (uses_ssl ? "rpcaps://" : PCAP_SRC_IF_STRING),
2081 PCAP_BUF_SIZE);
2082 if (host != NULL && *host != '\0') {
2083 if (strchr(host, ':') != NULL) {
2084 /*
2085 * The host name contains a colon, so it's
2086 * probably an IPv6 address, and needs to
2087 * be included in square brackets.
2088 */
2089 pcap_strlcat(source, "[", PCAP_BUF_SIZE);
2090 pcap_strlcat(source, host, PCAP_BUF_SIZE);
2091 pcap_strlcat(source, "]", PCAP_BUF_SIZE);
2092 } else
2093 pcap_strlcat(source, host, PCAP_BUF_SIZE);
2094
2095 if (port != NULL && *port != '\0') {
2096 pcap_strlcat(source, ":", PCAP_BUF_SIZE);
2097 pcap_strlcat(source, port, PCAP_BUF_SIZE);
2098 }
2099
2100 pcap_strlcat(source, "/", PCAP_BUF_SIZE);
2101 } else {
2102 snprintf(errbuf, PCAP_ERRBUF_SIZE,
2103 "The host name cannot be NULL.");
2104 return (-1);
2105 }
2106
2107 if (name != NULL && *name != '\0')
2108 pcap_strlcat(source, name, PCAP_BUF_SIZE);
2109
2110 return (0);
2111
2112 case PCAP_SRC_IFLOCAL:
2113 pcap_strlcpy(source, PCAP_SRC_IF_STRING, PCAP_BUF_SIZE);
2114
2115 if (name != NULL && *name != '\0')
2116 pcap_strlcat(source, name, PCAP_BUF_SIZE);
2117
2118 return (0);
2119
2120 default:
2121 snprintf(errbuf, PCAP_ERRBUF_SIZE,
2122 "The interface type is not valid.");
2123 return (-1);
2124 }
2125 }
2126
2127
2128 int
2129 pcap_createsrcstr(char *source, int type, const char *host, const char *port,
2130 const char *name, char *errbuf)
2131 {
2132 return (pcap_createsrcstr_ex(source, type, host, port, name, 0, errbuf));
2133 }
2134
2135 int
2136 pcap_parsesrcstr_ex(const char *source, int *type, char *host, char *port,
2137 char *name, unsigned char *uses_ssl, char *errbuf)
2138 {
2139 char *scheme, *tmpuserinfo, *tmphost, *tmpport, *tmppath;
2140
2141 /* Initialization stuff */
2142 if (host)
2143 *host = '\0';
2144 if (port)
2145 *port = '\0';
2146 if (name)
2147 *name = '\0';
2148 if (uses_ssl)
2149 *uses_ssl = 0;
2150
2151 /* Parse the source string */
2152 if (pcap_parse_source(source, &scheme, &tmpuserinfo, &tmphost,
2153 &tmpport, &tmppath, errbuf) == -1) {
2154 /*
2155 * Fail.
2156 */
2157 return (-1);
2158 }
2159
2160 if (scheme == NULL) {
2161 /*
2162 * Local device.
2163 */
2164 if (name && tmppath)
2165 pcap_strlcpy(name, tmppath, PCAP_BUF_SIZE);
2166 if (type)
2167 *type = PCAP_SRC_IFLOCAL;
2168 free(tmppath);
2169 free(tmpport);
2170 free(tmphost);
2171 free(tmpuserinfo);
2172 return (0);
2173 }
2174
2175 int is_rpcap = 0;
2176 if (strcmp(scheme, "rpcaps") == 0) {
2177 is_rpcap = 1;
2178 if (uses_ssl) *uses_ssl = 1;
2179 } else if (strcmp(scheme, "rpcap") == 0) {
2180 is_rpcap = 1;
2181 }
2182
2183 if (is_rpcap) {
2184 /*
2185 * rpcap[s]://
2186 *
2187 * pcap_parse_source() has already handled the case of
2188 * rpcap[s]://device
2189 */
2190 if (host && tmphost) {
2191 if (tmpuserinfo)
2192 snprintf(host, PCAP_BUF_SIZE, "%s@%s",
2193 tmpuserinfo, tmphost);
2194 else
2195 pcap_strlcpy(host, tmphost, PCAP_BUF_SIZE);
2196 }
2197 if (port && tmpport)
2198 pcap_strlcpy(port, tmpport, PCAP_BUF_SIZE);
2199 if (name && tmppath)
2200 pcap_strlcpy(name, tmppath, PCAP_BUF_SIZE);
2201 if (type)
2202 *type = PCAP_SRC_IFREMOTE;
2203 free(tmppath);
2204 free(tmpport);
2205 free(tmphost);
2206 free(tmpuserinfo);
2207 free(scheme);
2208 return (0);
2209 }
2210
2211 if (strcmp(scheme, "file") == 0) {
2212 /*
2213 * file://
2214 */
2215 if (name && tmppath)
2216 pcap_strlcpy(name, tmppath, PCAP_BUF_SIZE);
2217 if (type)
2218 *type = PCAP_SRC_FILE;
2219 free(tmppath);
2220 free(tmpport);
2221 free(tmphost);
2222 free(tmpuserinfo);
2223 free(scheme);
2224 return (0);
2225 }
2226
2227 /*
2228 * Neither rpcap: nor file:; just treat the entire string
2229 * as a local device.
2230 */
2231 if (name)
2232 pcap_strlcpy(name, source, PCAP_BUF_SIZE);
2233 if (type)
2234 *type = PCAP_SRC_IFLOCAL;
2235 free(tmppath);
2236 free(tmpport);
2237 free(tmphost);
2238 free(tmpuserinfo);
2239 free(scheme);
2240 return (0);
2241 }
2242
2243 int
2244 pcap_parsesrcstr(const char *source, int *type, char *host, char *port,
2245 char *name, char *errbuf)
2246 {
2247 return (pcap_parsesrcstr_ex(source, type, host, port, name, NULL, errbuf));
2248 }
2249 #endif
2250
2251 pcap_t *
2252 pcap_create(const char *device, char *errbuf)
2253 {
2254 size_t i;
2255 int is_theirs;
2256 pcap_t *p;
2257 char *device_str;
2258
2259 /*
2260 * A null device name is equivalent to the "any" device -
2261 * which might not be supported on this platform, but
2262 * this means that you'll get a "not supported" error
2263 * rather than, say, a crash when we try to dereference
2264 * the null pointer.
2265 */
2266 if (device == NULL)
2267 device_str = strdup("any");
2268 else {
2269 #ifdef _WIN32
2270 /*
2271 * On Windows, for backwards compatibility reasons,
2272 * pcap_lookupdev() returns a pointer to a sequence of
2273 * pairs of UTF-16LE device names and local code page
2274 * description strings.
2275 *
2276 * This means that if a program uses pcap_lookupdev()
2277 * to get a default device, and hands that to an API
2278 * that opens devices, we'll get handed a UTF-16LE
2279 * string, not a string in the local code page.
2280 *
2281 * To work around that, we check whether the string
2282 * looks as if it might be a UTF-16LE string and, if
2283 * so, convert it back to the local code page's
2284 * extended ASCII.
2285 *
2286 * We disable that check in "new API" mode, because:
2287 *
2288 * 1) You *cannot* reliably detect whether a
2289 * string is UTF-16LE or not; "a" could either
2290 * be a one-character ASCII string or the first
2291 * character of a UTF-16LE string.
2292 *
2293 * 2) Doing that test can run past the end of
2294 * the string, if it's a 1-character ASCII
2295 * string
2296 *
2297 * This particular version of this heuristic dates
2298 * back to WinPcap 4.1.1; PacketOpenAdapter() does
2299 * uses the same heuristic, with the exact same
2300 * vulnerability.
2301 *
2302 * That's why we disable this in "new API" mode.
2303 * We keep it around in legacy mode for backwards
2304 * compatibility.
2305 */
2306 if (!pcap_new_api && device[0] != '\0' && device[1] == '\0') {
2307 size_t length;
2308
2309 length = wcslen((wchar_t *)device);
2310 device_str = (char *)malloc(length + 1);
2311 if (device_str == NULL) {
2312 pcap_fmt_errmsg_for_errno(errbuf,
2313 PCAP_ERRBUF_SIZE, errno,
2314 "malloc");
2315 return (NULL);
2316 }
2317
2318 snprintf(device_str, length + 1, "%ws",
2319 (const wchar_t *)device);
2320 } else
2321 #endif
2322 device_str = strdup(device);
2323 }
2324 if (device_str == NULL) {
2325 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
2326 errno, "malloc");
2327 return (NULL);
2328 }
2329
2330 /*
2331 * Try each of the non-local-network-interface capture
2332 * source types until we find one that works for this
2333 * device or run out of types.
2334 */
2335 for (i = 0; capture_source_types[i].create_op != NULL; i++) {
2336 is_theirs = 0;
2337 p = capture_source_types[i].create_op(device_str, errbuf,
2338 &is_theirs);
2339 if (is_theirs) {
2340 /*
2341 * The device name refers to a device of the
2342 * type in question; either it succeeded,
2343 * in which case p refers to a pcap_t to
2344 * later activate for the device, or it
2345 * failed, in which case p is null and we
2346 * should return that to report the failure
2347 * to create.
2348 */
2349 if (p == NULL) {
2350 /*
2351 * We assume the caller filled in errbuf.
2352 */
2353 free(device_str);
2354 return (NULL);
2355 }
2356 p->opt.device = device_str;
2357 return (p);
2358 }
2359 }
2360
2361 /*
2362 * OK, try it as a regular network interface.
2363 */
2364 p = pcap_create_interface(device_str, errbuf);
2365 if (p == NULL) {
2366 /*
2367 * We assume the caller filled in errbuf.
2368 */
2369 free(device_str);
2370 return (NULL);
2371 }
2372 p->opt.device = device_str;
2373 return (p);
2374 }
2375
2376 /*
2377 * Set nonblocking mode on an unactivated pcap_t; this sets a flag
2378 * checked by pcap_activate(), which sets the mode after calling
2379 * the activate routine.
2380 */
2381 static int
2382 pcap_setnonblock_unactivated(pcap_t *p, int nonblock)
2383 {
2384 p->opt.nonblock = nonblock;
2385 return (0);
2386 }
2387
2388 static void
2389 initialize_ops(pcap_t *p)
2390 {
2391 /*
2392 * Set operation pointers for operations that only work on
2393 * an activated pcap_t to point to a routine that returns
2394 * a "this isn't activated" error.
2395 */
2396 p->read_op = pcap_read_not_initialized;
2397 p->inject_op = pcap_inject_not_initialized;
2398 p->setfilter_op = pcap_setfilter_not_initialized;
2399 p->setdirection_op = pcap_setdirection_not_initialized;
2400 p->set_datalink_op = pcap_set_datalink_not_initialized;
2401 p->getnonblock_op = pcap_getnonblock_not_initialized;
2402 p->stats_op = pcap_stats_not_initialized;
2403 #ifdef _WIN32
2404 p->stats_ex_op = pcap_stats_ex_not_initialized;
2405 p->setbuff_op = pcap_setbuff_not_initialized;
2406 p->setmode_op = pcap_setmode_not_initialized;
2407 p->setmintocopy_op = pcap_setmintocopy_not_initialized;
2408 p->getevent_op = pcap_getevent_not_initialized;
2409 p->oid_get_request_op = pcap_oid_get_request_not_initialized;
2410 p->oid_set_request_op = pcap_oid_set_request_not_initialized;
2411 p->sendqueue_transmit_op = pcap_sendqueue_transmit_not_initialized;
2412 p->setuserbuffer_op = pcap_setuserbuffer_not_initialized;
2413 p->live_dump_op = pcap_live_dump_not_initialized;
2414 p->live_dump_ended_op = pcap_live_dump_ended_not_initialized;
2415 p->get_airpcap_handle_op = pcap_get_airpcap_handle_not_initialized;
2416 #endif
2417
2418 /*
2419 * Default cleanup operation - implementations can override
2420 * this, but should call pcap_cleanup_live_common() after
2421 * doing their own additional cleanup.
2422 */
2423 p->cleanup_op = pcap_cleanup_live_common;
2424
2425 /*
2426 * In most cases, the standard one-shot callback can
2427 * be used for pcap_next()/pcap_next_ex().
2428 */
2429 p->oneshot_callback = pcap_oneshot;
2430
2431 /*
2432 * Default breakloop operation - implementations can override
2433 * this, but should call pcap_breakloop_common() before doing
2434 * their own logic.
2435 */
2436 p->breakloop_op = pcap_breakloop_common;
2437 }
2438
2439 static pcap_t *
2440 pcap_alloc_pcap_t(char *ebuf, size_t total_size, size_t private_offset)
2441 {
2442 char *chunk;
2443 pcap_t *p;
2444
2445 /*
2446 * total_size is the size of a structure containing a pcap_t
2447 * followed by a private structure.
2448 */
2449 chunk = calloc(total_size, 1);
2450 if (chunk == NULL) {
2451 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
2452 errno, "malloc");
2453 return (NULL);
2454 }
2455
2456 /*
2457 * Get a pointer to the pcap_t at the beginning.
2458 */
2459 p = (pcap_t *)chunk;
2460
2461 #ifdef _WIN32
2462 p->handle = INVALID_HANDLE_VALUE; /* not opened yet */
2463 #else /* _WIN32 */
2464 p->fd = -1; /* not opened yet */
2465 #ifndef MSDOS
2466 p->selectable_fd = -1;
2467 p->required_select_timeout = NULL;
2468 #endif /* MSDOS */
2469 #endif /* _WIN32 */
2470
2471 /*
2472 * private_offset is the offset, in bytes, of the private
2473 * data from the beginning of the structure.
2474 *
2475 * Set the pointer to the private data; that's private_offset
2476 * bytes past the pcap_t.
2477 */
2478 p->priv = (void *)(chunk + private_offset);
2479
2480 return (p);
2481 }
2482
2483 pcap_t *
2484 pcap_create_common(char *ebuf, size_t total_size, size_t private_offset)
2485 {
2486 pcap_t *p;
2487
2488 p = pcap_alloc_pcap_t(ebuf, total_size, private_offset);
2489 if (p == NULL)
2490 return (NULL);
2491
2492 /*
2493 * Default to "can't set rfmon mode"; if it's supported by
2494 * a platform, the create routine that called us can set
2495 * the op to its routine to check whether a particular
2496 * device supports it.
2497 */
2498 p->can_set_rfmon_op = pcap_cant_set_rfmon;
2499
2500 /*
2501 * If pcap_setnonblock() is called on a not-yet-activated
2502 * pcap_t, default to setting a flag and turning
2503 * on non-blocking mode when activated.
2504 */
2505 p->setnonblock_op = pcap_setnonblock_unactivated;
2506
2507 initialize_ops(p);
2508
2509 /* put in some defaults*/
2510 p->snapshot = 0; /* max packet size unspecified */
2511 p->opt.timeout = 0; /* no timeout specified */
2512 p->opt.buffer_size = 0; /* use the platform's default */
2513 p->opt.promisc = 0;
2514 p->opt.rfmon = 0;
2515 p->opt.immediate = 0;
2516 p->opt.tstamp_type = -1; /* default to not setting time stamp type */
2517 p->opt.tstamp_precision = PCAP_TSTAMP_PRECISION_MICRO;
2518 /*
2519 * Platform-dependent options.
2520 */
2521 #ifdef __linux__
2522 p->opt.protocol = 0;
2523 #endif
2524 #ifdef _WIN32
2525 p->opt.nocapture_local = 0;
2526 #endif
2527
2528 /*
2529 * Start out with no BPF code generation flags set.
2530 */
2531 p->bpf_codegen_flags = 0;
2532
2533 return (p);
2534 }
2535
2536 int
2537 pcap_check_activated(pcap_t *p)
2538 {
2539 if (p->activated) {
2540 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "can't perform "
2541 " operation on activated capture");
2542 return (-1);
2543 }
2544 return (0);
2545 }
2546
2547 int
2548 pcap_set_snaplen(pcap_t *p, int snaplen)
2549 {
2550 if (pcap_check_activated(p))
2551 return (PCAP_ERROR_ACTIVATED);
2552 p->snapshot = snaplen;
2553 return (0);
2554 }
2555
2556 int
2557 pcap_set_promisc(pcap_t *p, int promisc)
2558 {
2559 if (pcap_check_activated(p))
2560 return (PCAP_ERROR_ACTIVATED);
2561 p->opt.promisc = promisc;
2562 return (0);
2563 }
2564
2565 int
2566 pcap_set_rfmon(pcap_t *p, int rfmon)
2567 {
2568 if (pcap_check_activated(p))
2569 return (PCAP_ERROR_ACTIVATED);
2570 p->opt.rfmon = rfmon;
2571 return (0);
2572 }
2573
2574 int
2575 pcap_set_timeout(pcap_t *p, int timeout_ms)
2576 {
2577 if (pcap_check_activated(p))
2578 return (PCAP_ERROR_ACTIVATED);
2579 p->opt.timeout = timeout_ms;
2580 return (0);
2581 }
2582
2583 int
2584 pcap_set_tstamp_type(pcap_t *p, int tstamp_type)
2585 {
2586 int i;
2587
2588 if (pcap_check_activated(p))
2589 return (PCAP_ERROR_ACTIVATED);
2590
2591 /*
2592 * The argument should have been u_int, but that's too late
2593 * to change now - it's an API.
2594 */
2595 if (tstamp_type < 0)
2596 return (PCAP_WARNING_TSTAMP_TYPE_NOTSUP);
2597
2598 /*
2599 * If p->tstamp_type_count is 0, we only support PCAP_TSTAMP_HOST;
2600 * the default time stamp type is PCAP_TSTAMP_HOST.
2601 */
2602 if (p->tstamp_type_count == 0) {
2603 if (tstamp_type == PCAP_TSTAMP_HOST) {
2604 p->opt.tstamp_type = tstamp_type;
2605 return (0);
2606 }
2607 } else {
2608 /*
2609 * Check whether we claim to support this type of time stamp.
2610 */
2611 for (i = 0; i < p->tstamp_type_count; i++) {
2612 if (p->tstamp_type_list[i] == (u_int)tstamp_type) {
2613 /*
2614 * Yes.
2615 */
2616 p->opt.tstamp_type = tstamp_type;
2617 return (0);
2618 }
2619 }
2620 }
2621
2622 /*
2623 * We don't support this type of time stamp.
2624 */
2625 return (PCAP_WARNING_TSTAMP_TYPE_NOTSUP);
2626 }
2627
2628 int
2629 pcap_set_immediate_mode(pcap_t *p, int immediate)
2630 {
2631 if (pcap_check_activated(p))
2632 return (PCAP_ERROR_ACTIVATED);
2633 p->opt.immediate = immediate;
2634 return (0);
2635 }
2636
2637 int
2638 pcap_set_buffer_size(pcap_t *p, int buffer_size)
2639 {
2640 if (pcap_check_activated(p))
2641 return (PCAP_ERROR_ACTIVATED);
2642 if (buffer_size <= 0) {
2643 /*
2644 * Silently ignore invalid values.
2645 */
2646 return (0);
2647 }
2648 p->opt.buffer_size = buffer_size;
2649 return (0);
2650 }
2651
2652 int
2653 pcap_set_tstamp_precision(pcap_t *p, int tstamp_precision)
2654 {
2655 int i;
2656
2657 if (pcap_check_activated(p))
2658 return (PCAP_ERROR_ACTIVATED);
2659
2660 /*
2661 * The argument should have been u_int, but that's too late
2662 * to change now - it's an API.
2663 */
2664 if (tstamp_precision < 0)
2665 return (PCAP_ERROR_TSTAMP_PRECISION_NOTSUP);
2666
2667 /*
2668 * If p->tstamp_precision_count is 0, we only support setting
2669 * the time stamp precision to microsecond precision; every
2670 * pcap module *MUST* support microsecond precision, even if
2671 * it does so by converting the native precision to
2672 * microseconds.
2673 */
2674 if (p->tstamp_precision_count == 0) {
2675 if (tstamp_precision == PCAP_TSTAMP_PRECISION_MICRO) {
2676 p->opt.tstamp_precision = tstamp_precision;
2677 return (0);
2678 }
2679 } else {
2680 /*
2681 * Check whether we claim to support this precision of
2682 * time stamp.
2683 */
2684 for (i = 0; i < p->tstamp_precision_count; i++) {
2685 if (p->tstamp_precision_list[i] == (u_int)tstamp_precision) {
2686 /*
2687 * Yes.
2688 */
2689 p->opt.tstamp_precision = tstamp_precision;
2690 return (0);
2691 }
2692 }
2693 }
2694
2695 /*
2696 * We don't support this time stamp precision.
2697 */
2698 return (PCAP_ERROR_TSTAMP_PRECISION_NOTSUP);
2699 }
2700
2701 int
2702 pcap_get_tstamp_precision(pcap_t *p)
2703 {
2704 return (p->opt.tstamp_precision);
2705 }
2706
2707 int
2708 pcap_activate(pcap_t *p)
2709 {
2710 int status;
2711
2712 /*
2713 * Catch attempts to re-activate an already-activated
2714 * pcap_t; this should, for example, catch code that
2715 * calls pcap_open_live() followed by pcap_activate(),
2716 * as some code that showed up in a Stack Exchange
2717 * question did.
2718 */
2719 if (pcap_check_activated(p))
2720 return (PCAP_ERROR_ACTIVATED);
2721 status = p->activate_op(p);
2722 if (status >= 0) {
2723 /*
2724 * If somebody requested non-blocking mode before
2725 * calling pcap_activate(), turn it on now.
2726 */
2727 if (p->opt.nonblock) {
2728 status = p->setnonblock_op(p, 1);
2729 if (status < 0) {
2730 /*
2731 * Failed. Undo everything done by
2732 * the activate operation.
2733 */
2734 p->cleanup_op(p);
2735 initialize_ops(p);
2736 return (status);
2737 }
2738 }
2739 p->activated = 1;
2740 } else {
2741 if (p->errbuf[0] == '\0') {
2742 /*
2743 * No error message supplied by the activate routine;
2744 * for the benefit of programs that don't specially
2745 * handle errors other than PCAP_ERROR, return the
2746 * error message corresponding to the status.
2747 */
2748 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s",
2749 pcap_statustostr(status));
2750 }
2751
2752 /*
2753 * Undo any operation pointer setting, etc. done by
2754 * the activate operation.
2755 */
2756 initialize_ops(p);
2757 }
2758 return (status);
2759 }
2760
2761 pcap_t *
2762 pcap_open_live(const char *device, int snaplen, int promisc, int to_ms, char *errbuf)
2763 {
2764 pcap_t *p;
2765 int status;
2766 #ifdef ENABLE_REMOTE
2767 char host[PCAP_BUF_SIZE + 1];
2768 char port[PCAP_BUF_SIZE + 1];
2769 char name[PCAP_BUF_SIZE + 1];
2770 int srctype;
2771
2772 /*
2773 * A null device name is equivalent to the "any" device -
2774 * which might not be supported on this platform, but
2775 * this means that you'll get a "not supported" error
2776 * rather than, say, a crash when we try to dereference
2777 * the null pointer.
2778 */
2779 if (device == NULL)
2780 device = "any";
2781
2782 /*
2783 * Retrofit - we have to make older applications compatible with
2784 * remote capture.
2785 * So we're calling pcap_open_remote() from here; this is a very
2786 * dirty hack.
2787 * Obviously, we cannot exploit all the new features; for instance,
2788 * we cannot send authentication, we cannot use a UDP data connection,
2789 * and so on.
2790 */
2791 if (pcap_parsesrcstr(device, &srctype, host, port, name, errbuf))
2792 return (NULL);
2793
2794 if (srctype == PCAP_SRC_IFREMOTE) {
2795 /*
2796 * Although we already have host, port and iface, we prefer
2797 * to pass only 'device' to pcap_open_rpcap(), so that it has
2798 * to call pcap_parsesrcstr() again.
2799 * This is less optimized, but much clearer.
2800 */
2801 return (pcap_open_rpcap(device, snaplen,
2802 promisc ? PCAP_OPENFLAG_PROMISCUOUS : 0, to_ms,
2803 NULL, errbuf));
2804 }
2805 if (srctype == PCAP_SRC_FILE) {
2806 snprintf(errbuf, PCAP_ERRBUF_SIZE, "unknown URL scheme \"file\"");
2807 return (NULL);
2808 }
2809 if (srctype == PCAP_SRC_IFLOCAL) {
2810 /*
2811 * If it starts with rpcap://, that refers to a local device
2812 * (no host part in the URL). Remove the rpcap://, and
2813 * fall through to the regular open path.
2814 */
2815 if (strncmp(device, PCAP_SRC_IF_STRING, strlen(PCAP_SRC_IF_STRING)) == 0) {
2816 size_t len = strlen(device) - strlen(PCAP_SRC_IF_STRING) + 1;
2817
2818 if (len > 0)
2819 device += strlen(PCAP_SRC_IF_STRING);
2820 }
2821 }
2822 #endif /* ENABLE_REMOTE */
2823
2824 p = pcap_create(device, errbuf);
2825 if (p == NULL)
2826 return (NULL);
2827 status = pcap_set_snaplen(p, snaplen);
2828 if (status < 0)
2829 goto fail;
2830 status = pcap_set_promisc(p, promisc);
2831 if (status < 0)
2832 goto fail;
2833 status = pcap_set_timeout(p, to_ms);
2834 if (status < 0)
2835 goto fail;
2836 /*
2837 * Mark this as opened with pcap_open_live(), so that, for
2838 * example, we show the full list of DLT_ values, rather
2839 * than just the ones that are compatible with capturing
2840 * when not in monitor mode. That allows existing applications
2841 * to work the way they used to work, but allows new applications
2842 * that know about the new open API to, for example, find out the
2843 * DLT_ values that they can select without changing whether
2844 * the adapter is in monitor mode or not.
2845 */
2846 p->oldstyle = 1;
2847 status = pcap_activate(p);
2848 if (status < 0)
2849 goto fail;
2850 return (p);
2851 fail:
2852 if (status == PCAP_ERROR)
2853 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %.*s", device,
2854 PCAP_ERRBUF_SIZE - 3, p->errbuf);
2855 else if (status == PCAP_ERROR_NO_SUCH_DEVICE ||
2856 status == PCAP_ERROR_PERM_DENIED ||
2857 status == PCAP_ERROR_PROMISC_PERM_DENIED)
2858 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s (%.*s)", device,
2859 pcap_statustostr(status), PCAP_ERRBUF_SIZE - 6, p->errbuf);
2860 else
2861 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", device,
2862 pcap_statustostr(status));
2863 pcap_close(p);
2864 return (NULL);
2865 }
2866
2867 pcap_t *
2868 pcap_open_offline_common(char *ebuf, size_t total_size, size_t private_offset)
2869 {
2870 pcap_t *p;
2871
2872 p = pcap_alloc_pcap_t(ebuf, total_size, private_offset);
2873 if (p == NULL)
2874 return (NULL);
2875
2876 p->opt.tstamp_precision = PCAP_TSTAMP_PRECISION_MICRO;
2877
2878 return (p);
2879 }
2880
2881 int
2882 pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
2883 {
2884 return (p->read_op(p, cnt, callback, user));
2885 }
2886
2887 int
2888 pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
2889 {
2890 register int n;
2891
2892 for (;;) {
2893 if (p->rfile != NULL) {
2894 /*
2895 * 0 means EOF, so don't loop if we get 0.
2896 */
2897 n = pcap_offline_read(p, cnt, callback, user);
2898 } else {
2899 /*
2900 * XXX keep reading until we get something
2901 * (or an error occurs)
2902 */
2903 do {
2904 n = p->read_op(p, cnt, callback, user);
2905 } while (n == 0);
2906 }
2907 if (n <= 0)
2908 return (n);
2909 if (!PACKET_COUNT_IS_UNLIMITED(cnt)) {
2910 cnt -= n;
2911 if (cnt <= 0)
2912 return (0);
2913 }
2914 }
2915 }
2916
2917 /*
2918 * Force the loop in "pcap_read()" or "pcap_read_offline()" to terminate.
2919 */
2920 void
2921 pcap_breakloop(pcap_t *p)
2922 {
2923 p->breakloop_op(p);
2924 }
2925
2926 int
2927 pcap_datalink(pcap_t *p)
2928 {
2929 if (!p->activated)
2930 return (PCAP_ERROR_NOT_ACTIVATED);
2931 return (p->linktype);
2932 }
2933
2934 int
2935 pcap_datalink_ext(pcap_t *p)
2936 {
2937 if (!p->activated)
2938 return (PCAP_ERROR_NOT_ACTIVATED);
2939 return (p->linktype_ext);
2940 }
2941
2942 int
2943 pcap_list_datalinks(pcap_t *p, int **dlt_buffer)
2944 {
2945 if (!p->activated)
2946 return (PCAP_ERROR_NOT_ACTIVATED);
2947 if (p->dlt_count == 0) {
2948 /*
2949 * We couldn't fetch the list of DLTs, which means
2950 * this platform doesn't support changing the
2951 * DLT for an interface. Return a list of DLTs
2952 * containing only the DLT this device supports.
2953 */
2954 *dlt_buffer = (int*)malloc(sizeof(**dlt_buffer));
2955 if (*dlt_buffer == NULL) {
2956 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
2957 errno, "malloc");
2958 return (PCAP_ERROR);
2959 }
2960 **dlt_buffer = p->linktype;
2961 return (1);
2962 } else {
2963 *dlt_buffer = (int*)calloc(sizeof(**dlt_buffer), p->dlt_count);
2964 if (*dlt_buffer == NULL) {
2965 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
2966 errno, "malloc");
2967 return (PCAP_ERROR);
2968 }
2969 (void)memcpy(*dlt_buffer, p->dlt_list,
2970 sizeof(**dlt_buffer) * p->dlt_count);
2971 return (p->dlt_count);
2972 }
2973 }
2974
2975 /*
2976 * In Windows, you might have a library built with one version of the
2977 * C runtime library and an application built with another version of
2978 * the C runtime library, which means that the library might use one
2979 * version of malloc() and free() and the application might use another
2980 * version of malloc() and free(). If so, that means something
2981 * allocated by the library cannot be freed by the application, so we
2982 * need to have a pcap_free_datalinks() routine to free up the list
2983 * allocated by pcap_list_datalinks(), even though it's just a wrapper
2984 * around free().
2985 */
2986 void
2987 pcap_free_datalinks(int *dlt_list)
2988 {
2989 free(dlt_list);
2990 }
2991
2992 int
2993 pcap_set_datalink(pcap_t *p, int dlt)
2994 {
2995 int i;
2996 const char *dlt_name;
2997
2998 if (dlt < 0)
2999 goto unsupported;
3000
3001 if (p->dlt_count == 0 || p->set_datalink_op == NULL) {
3002 /*
3003 * We couldn't fetch the list of DLTs, or we don't
3004 * have a "set datalink" operation, which means
3005 * this platform doesn't support changing the
3006 * DLT for an interface. Check whether the new
3007 * DLT is the one this interface supports.
3008 */
3009 if (p->linktype != dlt)
3010 goto unsupported;
3011
3012 /*
3013 * It is, so there's nothing we need to do here.
3014 */
3015 return (0);
3016 }
3017 for (i = 0; i < p->dlt_count; i++)
3018 if (p->dlt_list[i] == (u_int)dlt)
3019 break;
3020 if (i >= p->dlt_count)
3021 goto unsupported;
3022 if (p->dlt_count == 2 && p->dlt_list[0] == DLT_EN10MB &&
3023 dlt == DLT_DOCSIS) {
3024 /*
3025 * This is presumably an Ethernet device, as the first
3026 * link-layer type it offers is DLT_EN10MB, and the only
3027 * other type it offers is DLT_DOCSIS. That means that
3028 * we can't tell the driver to supply DOCSIS link-layer
3029 * headers - we're just pretending that's what we're
3030 * getting, as, presumably, we're capturing on a dedicated
3031 * link to a Cisco Cable Modem Termination System, and
3032 * it's putting raw DOCSIS frames on the wire inside low-level
3033 * Ethernet framing.
3034 */
3035 p->linktype = dlt;
3036 return (0);
3037 }
3038 if (p->set_datalink_op(p, dlt) == -1)
3039 return (-1);
3040 p->linktype = dlt;
3041 return (0);
3042
3043 unsupported:
3044 dlt_name = pcap_datalink_val_to_name(dlt);
3045 if (dlt_name != NULL) {
3046 (void) snprintf(p->errbuf, sizeof(p->errbuf),
3047 "%s is not one of the DLTs supported by this device",
3048 dlt_name);
3049 } else {
3050 (void) snprintf(p->errbuf, sizeof(p->errbuf),
3051 "DLT %d is not one of the DLTs supported by this device",
3052 dlt);
3053 }
3054 return (-1);
3055 }
3056
3057 /*
3058 * This array is designed for mapping upper and lower case letter
3059 * together for a case independent comparison. The mappings are
3060 * based upon ascii character sequences.
3061 */
3062 static const u_char charmap[] = {
3063 (u_char)'\000', (u_char)'\001', (u_char)'\002', (u_char)'\003',
3064 (u_char)'\004', (u_char)'\005', (u_char)'\006', (u_char)'\007',
3065 (u_char)'\010', (u_char)'\011', (u_char)'\012', (u_char)'\013',
3066 (u_char)'\014', (u_char)'\015', (u_char)'\016', (u_char)'\017',
3067 (u_char)'\020', (u_char)'\021', (u_char)'\022', (u_char)'\023',
3068 (u_char)'\024', (u_char)'\025', (u_char)'\026', (u_char)'\027',
3069 (u_char)'\030', (u_char)'\031', (u_char)'\032', (u_char)'\033',
3070 (u_char)'\034', (u_char)'\035', (u_char)'\036', (u_char)'\037',
3071 (u_char)'\040', (u_char)'\041', (u_char)'\042', (u_char)'\043',
3072 (u_char)'\044', (u_char)'\045', (u_char)'\046', (u_char)'\047',
3073 (u_char)'\050', (u_char)'\051', (u_char)'\052', (u_char)'\053',
3074 (u_char)'\054', (u_char)'\055', (u_char)'\056', (u_char)'\057',
3075 (u_char)'\060', (u_char)'\061', (u_char)'\062', (u_char)'\063',
3076 (u_char)'\064', (u_char)'\065', (u_char)'\066', (u_char)'\067',
3077 (u_char)'\070', (u_char)'\071', (u_char)'\072', (u_char)'\073',
3078 (u_char)'\074', (u_char)'\075', (u_char)'\076', (u_char)'\077',
3079 (u_char)'\100', (u_char)'\141', (u_char)'\142', (u_char)'\143',
3080 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147',
3081 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153',
3082 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157',
3083 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163',
3084 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167',
3085 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\133',
3086 (u_char)'\134', (u_char)'\135', (u_char)'\136', (u_char)'\137',
3087 (u_char)'\140', (u_char)'\141', (u_char)'\142', (u_char)'\143',
3088 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147',
3089 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153',
3090 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157',
3091 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163',
3092 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167',
3093 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\173',
3094 (u_char)'\174', (u_char)'\175', (u_char)'\176', (u_char)'\177',
3095 (u_char)'\200', (u_char)'\201', (u_char)'\202', (u_char)'\203',
3096 (u_char)'\204', (u_char)'\205', (u_char)'\206', (u_char)'\207',
3097 (u_char)'\210', (u_char)'\211', (u_char)'\212', (u_char)'\213',
3098 (u_char)'\214', (u_char)'\215', (u_char)'\216', (u_char)'\217',
3099 (u_char)'\220', (u_char)'\221', (u_char)'\222', (u_char)'\223',
3100 (u_char)'\224', (u_char)'\225', (u_char)'\226', (u_char)'\227',
3101 (u_char)'\230', (u_char)'\231', (u_char)'\232', (u_char)'\233',
3102 (u_char)'\234', (u_char)'\235', (u_char)'\236', (u_char)'\237',
3103 (u_char)'\240', (u_char)'\241', (u_char)'\242', (u_char)'\243',
3104 (u_char)'\244', (u_char)'\245', (u_char)'\246', (u_char)'\247',
3105 (u_char)'\250', (u_char)'\251', (u_char)'\252', (u_char)'\253',
3106 (u_char)'\254', (u_char)'\255', (u_char)'\256', (u_char)'\257',
3107 (u_char)'\260', (u_char)'\261', (u_char)'\262', (u_char)'\263',
3108 (u_char)'\264', (u_char)'\265', (u_char)'\266', (u_char)'\267',
3109 (u_char)'\270', (u_char)'\271', (u_char)'\272', (u_char)'\273',
3110 (u_char)'\274', (u_char)'\275', (u_char)'\276', (u_char)'\277',
3111 (u_char)'\300', (u_char)'\341', (u_char)'\342', (u_char)'\343',
3112 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347',
3113 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353',
3114 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357',
3115 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363',
3116 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367',
3117 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\333',
3118 (u_char)'\334', (u_char)'\335', (u_char)'\336', (u_char)'\337',
3119 (u_char)'\340', (u_char)'\341', (u_char)'\342', (u_char)'\343',
3120 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347',
3121 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353',
3122 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357',
3123 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363',
3124 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367',
3125 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\373',
3126 (u_char)'\374', (u_char)'\375', (u_char)'\376', (u_char)'\377',
3127 };
3128
3129 int
3130 pcap_strcasecmp(const char *s1, const char *s2)
3131 {
3132 register const u_char *cm = charmap,
3133 *us1 = (const u_char *)s1,
3134 *us2 = (const u_char *)s2;
3135
3136 while (cm[*us1] == cm[*us2++])
3137 if (*us1++ == '\0')
3138 return(0);
3139 return (cm[*us1] - cm[*--us2]);
3140 }
3141
3142 struct dlt_choice {
3143 const char *name;
3144 const char *description;
3145 int dlt;
3146 };
3147
3148 #define DLT_CHOICE(code, description) { #code, description, DLT_ ## code }
3149 #define DLT_CHOICE_SENTINEL { NULL, NULL, 0 }
3150
3151 static struct dlt_choice dlt_choices[] = {
3152 DLT_CHOICE(NULL, "BSD loopback"),
3153 DLT_CHOICE(EN10MB, "Ethernet"),
3154 DLT_CHOICE(IEEE802, "Token ring"),
3155 DLT_CHOICE(ARCNET, "BSD ARCNET"),
3156 DLT_CHOICE(SLIP, "SLIP"),
3157 DLT_CHOICE(PPP, "PPP"),
3158 DLT_CHOICE(FDDI, "FDDI"),
3159 DLT_CHOICE(ATM_RFC1483, "RFC 1483 LLC-encapsulated ATM"),
3160 DLT_CHOICE(RAW, "Raw IP"),
3161 DLT_CHOICE(SLIP_BSDOS, "BSD/OS SLIP"),
3162 DLT_CHOICE(PPP_BSDOS, "BSD/OS PPP"),
3163 DLT_CHOICE(ATM_CLIP, "Linux Classical IP over ATM"),
3164 DLT_CHOICE(PPP_SERIAL, "PPP over serial"),
3165 DLT_CHOICE(PPP_ETHER, "PPPoE"),
3166 DLT_CHOICE(SYMANTEC_FIREWALL, "Symantec Firewall"),
3167 DLT_CHOICE(C_HDLC, "Cisco HDLC"),
3168 DLT_CHOICE(IEEE802_11, "802.11"),
3169 DLT_CHOICE(FRELAY, "Frame Relay"),
3170 DLT_CHOICE(LOOP, "OpenBSD loopback"),
3171 DLT_CHOICE(ENC, "OpenBSD encapsulated IP"),
3172 DLT_CHOICE(LINUX_SLL, "Linux cooked v1"),
3173 DLT_CHOICE(LTALK, "Localtalk"),
3174 DLT_CHOICE(PFLOG, "OpenBSD pflog file"),
3175 DLT_CHOICE(PFSYNC, "Packet filter state syncing"),
3176 DLT_CHOICE(PRISM_HEADER, "802.11 plus Prism header"),
3177 DLT_CHOICE(IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"),
3178 DLT_CHOICE(SUNATM, "Sun raw ATM"),
3179 DLT_CHOICE(IEEE802_11_RADIO, "802.11 plus radiotap header"),
3180 DLT_CHOICE(ARCNET_LINUX, "Linux ARCNET"),
3181 DLT_CHOICE(JUNIPER_MLPPP, "Juniper Multi-Link PPP"),
3182 DLT_CHOICE(JUNIPER_MLFR, "Juniper Multi-Link Frame Relay"),
3183 DLT_CHOICE(JUNIPER_ES, "Juniper Encryption Services PIC"),
3184 DLT_CHOICE(JUNIPER_GGSN, "Juniper GGSN PIC"),
3185 DLT_CHOICE(JUNIPER_MFR, "Juniper FRF.16 Frame Relay"),
3186 DLT_CHOICE(JUNIPER_ATM2, "Juniper ATM2 PIC"),
3187 DLT_CHOICE(JUNIPER_SERVICES, "Juniper Advanced Services PIC"),
3188 DLT_CHOICE(JUNIPER_ATM1, "Juniper ATM1 PIC"),
3189 DLT_CHOICE(APPLE_IP_OVER_IEEE1394, "Apple IP-over-IEEE 1394"),
3190 DLT_CHOICE(MTP2_WITH_PHDR, "SS7 MTP2 with Pseudo-header"),
3191 DLT_CHOICE(MTP2, "SS7 MTP2"),
3192 DLT_CHOICE(MTP3, "SS7 MTP3"),
3193 DLT_CHOICE(SCCP, "SS7 SCCP"),
3194 DLT_CHOICE(DOCSIS, "DOCSIS"),
3195 DLT_CHOICE(LINUX_IRDA, "Linux IrDA"),
3196 DLT_CHOICE(IEEE802_11_RADIO_AVS, "802.11 plus AVS radio information header"),
3197 DLT_CHOICE(JUNIPER_MONITOR, "Juniper Passive Monitor PIC"),
3198 DLT_CHOICE(BACNET_MS_TP, "BACnet MS/TP"),
3199 DLT_CHOICE(PPP_PPPD, "PPP for pppd, with direction flag"),
3200 DLT_CHOICE(JUNIPER_PPPOE, "Juniper PPPoE"),
3201 DLT_CHOICE(JUNIPER_PPPOE_ATM, "Juniper PPPoE/ATM"),
3202 DLT_CHOICE(GPRS_LLC, "GPRS LLC"),
3203 DLT_CHOICE(GPF_T, "GPF-T"),
3204 DLT_CHOICE(GPF_F, "GPF-F"),
3205 DLT_CHOICE(JUNIPER_PIC_PEER, "Juniper PIC Peer"),
3206 DLT_CHOICE(ERF_ETH, "Ethernet with Endace ERF header"),
3207 DLT_CHOICE(ERF_POS, "Packet-over-SONET with Endace ERF header"),
3208 DLT_CHOICE(LINUX_LAPD, "Linux vISDN LAPD"),
3209 DLT_CHOICE(JUNIPER_ETHER, "Juniper Ethernet"),
3210 DLT_CHOICE(JUNIPER_PPP, "Juniper PPP"),
3211 DLT_CHOICE(JUNIPER_FRELAY, "Juniper Frame Relay"),
3212 DLT_CHOICE(JUNIPER_CHDLC, "Juniper C-HDLC"),
3213 DLT_CHOICE(MFR, "FRF.16 Frame Relay"),
3214 DLT_CHOICE(JUNIPER_VP, "Juniper Voice PIC"),
3215 DLT_CHOICE(A429, "Arinc 429"),
3216 DLT_CHOICE(A653_ICM, "Arinc 653 Interpartition Communication"),
3217 DLT_CHOICE(USB_FREEBSD, "USB with FreeBSD header"),
3218 DLT_CHOICE(BLUETOOTH_HCI_H4, "Bluetooth HCI UART transport layer"),
3219 DLT_CHOICE(IEEE802_16_MAC_CPS, "IEEE 802.16 MAC Common Part Sublayer"),
3220 DLT_CHOICE(USB_LINUX, "USB with Linux header"),
3221 DLT_CHOICE(CAN20B, "Controller Area Network (CAN) v. 2.0B"),
3222 DLT_CHOICE(IEEE802_15_4_LINUX, "IEEE 802.15.4 with Linux padding"),
3223 DLT_CHOICE(PPI, "Per-Packet Information"),
3224 DLT_CHOICE(IEEE802_16_MAC_CPS_RADIO, "IEEE 802.16 MAC Common Part Sublayer plus radiotap header"),
3225 DLT_CHOICE(JUNIPER_ISM, "Juniper Integrated Service Module"),
3226 DLT_CHOICE(IEEE802_15_4, "IEEE 802.15.4 with FCS"),
3227 DLT_CHOICE(SITA, "SITA pseudo-header"),
3228 DLT_CHOICE(ERF, "Endace ERF header"),
3229 DLT_CHOICE(RAIF1, "Ethernet with u10 Networks pseudo-header"),
3230 DLT_CHOICE(IPMB_KONTRON, "IPMB with Kontron pseudo-header"),
3231 DLT_CHOICE(JUNIPER_ST, "Juniper Secure Tunnel"),
3232 DLT_CHOICE(BLUETOOTH_HCI_H4_WITH_PHDR, "Bluetooth HCI UART transport layer plus pseudo-header"),
3233 DLT_CHOICE(AX25_KISS, "AX.25 with KISS header"),
3234 DLT_CHOICE(IPMB_LINUX, "IPMB with Linux/Pigeon Point pseudo-header"),
3235 DLT_CHOICE(IEEE802_15_4_NONASK_PHY, "IEEE 802.15.4 with non-ASK PHY data"),
3236 DLT_CHOICE(MPLS, "MPLS with label as link-layer header"),
3237 DLT_CHOICE(LINUX_EVDEV, "Linux evdev events"),
3238 DLT_CHOICE(USB_LINUX_MMAPPED, "USB with padded Linux header"),
3239 DLT_CHOICE(DECT, "DECT"),
3240 DLT_CHOICE(AOS, "AOS Space Data Link protocol"),
3241 DLT_CHOICE(WIHART, "Wireless HART"),
3242 DLT_CHOICE(FC_2, "Fibre Channel FC-2"),
3243 DLT_CHOICE(FC_2_WITH_FRAME_DELIMS, "Fibre Channel FC-2 with frame delimiters"),
3244 DLT_CHOICE(IPNET, "Solaris ipnet"),
3245 DLT_CHOICE(CAN_SOCKETCAN, "CAN-bus with SocketCAN headers"),
3246 DLT_CHOICE(IPV4, "Raw IPv4"),
3247 DLT_CHOICE(IPV6, "Raw IPv6"),
3248 DLT_CHOICE(IEEE802_15_4_NOFCS, "IEEE 802.15.4 without FCS"),
3249 DLT_CHOICE(DBUS, "D-Bus"),
3250 DLT_CHOICE(JUNIPER_VS, "Juniper Virtual Server"),
3251 DLT_CHOICE(JUNIPER_SRX_E2E, "Juniper SRX E2E"),
3252 DLT_CHOICE(JUNIPER_FIBRECHANNEL, "Juniper Fibre Channel"),
3253 DLT_CHOICE(DVB_CI, "DVB-CI"),
3254 DLT_CHOICE(MUX27010, "MUX27010"),
3255 DLT_CHOICE(STANAG_5066_D_PDU, "STANAG 5066 D_PDUs"),
3256 DLT_CHOICE(JUNIPER_ATM_CEMIC, "Juniper ATM CEMIC"),
3257 DLT_CHOICE(NFLOG, "Linux netfilter log messages"),
3258 DLT_CHOICE(NETANALYZER, "Ethernet with Hilscher netANALYZER pseudo-header"),
3259 DLT_CHOICE(NETANALYZER_TRANSPARENT, "Ethernet with Hilscher netANALYZER pseudo-header and with preamble and SFD"),
3260 DLT_CHOICE(IPOIB, "RFC 4391 IP-over-Infiniband"),
3261 DLT_CHOICE(MPEG_2_TS, "MPEG-2 transport stream"),
3262 DLT_CHOICE(NG40, "ng40 protocol tester Iub/Iur"),
3263 DLT_CHOICE(NFC_LLCP, "NFC LLCP PDUs with pseudo-header"),
3264 DLT_CHOICE(INFINIBAND, "InfiniBand"),
3265 DLT_CHOICE(SCTP, "SCTP"),
3266 DLT_CHOICE(USBPCAP, "USB with USBPcap header"),
3267 DLT_CHOICE(RTAC_SERIAL, "Schweitzer Engineering Laboratories RTAC packets"),
3268 DLT_CHOICE(BLUETOOTH_LE_LL, "Bluetooth Low Energy air interface"),
3269 DLT_CHOICE(NETLINK, "Linux netlink"),
3270 DLT_CHOICE(BLUETOOTH_LINUX_MONITOR, "Bluetooth Linux Monitor"),
3271 DLT_CHOICE(BLUETOOTH_BREDR_BB, "Bluetooth Basic Rate/Enhanced Data Rate baseband packets"),
3272 DLT_CHOICE(BLUETOOTH_LE_LL_WITH_PHDR, "Bluetooth Low Energy air interface with pseudo-header"),
3273 DLT_CHOICE(PROFIBUS_DL, "PROFIBUS data link layer"),
3274 DLT_CHOICE(PKTAP, "Apple DLT_PKTAP"),
3275 DLT_CHOICE(EPON, "Ethernet with 802.3 Clause 65 EPON preamble"),
3276 DLT_CHOICE(IPMI_HPM_2, "IPMI trace packets"),
3277 DLT_CHOICE(ZWAVE_R1_R2, "Z-Wave RF profile R1 and R2 packets"),
3278 DLT_CHOICE(ZWAVE_R3, "Z-Wave RF profile R3 packets"),
3279 DLT_CHOICE(WATTSTOPPER_DLM, "WattStopper Digital Lighting Management (DLM) and Legrand Nitoo Open protocol"),
3280 DLT_CHOICE(ISO_14443, "ISO 14443 messages"),
3281 DLT_CHOICE(RDS, "IEC 62106 Radio Data System groups"),
3282 DLT_CHOICE(USB_DARWIN, "USB with Darwin header"),
3283 DLT_CHOICE(OPENFLOW, "OpenBSD DLT_OPENFLOW"),
3284 DLT_CHOICE(SDLC, "IBM SDLC frames"),
3285 DLT_CHOICE(TI_LLN_SNIFFER, "TI LLN sniffer frames"),
3286 DLT_CHOICE(VSOCK, "Linux vsock"),
3287 DLT_CHOICE(NORDIC_BLE, "Nordic Semiconductor Bluetooth LE sniffer frames"),
3288 DLT_CHOICE(DOCSIS31_XRA31, "Excentis XRA-31 DOCSIS 3.1 RF sniffer frames"),
3289 DLT_CHOICE(ETHERNET_MPACKET, "802.3br mPackets"),
3290 DLT_CHOICE(DISPLAYPORT_AUX, "DisplayPort AUX channel monitoring data"),
3291 DLT_CHOICE(LINUX_SLL2, "Linux cooked v2"),
3292 DLT_CHOICE(OPENVIZSLA, "OpenVizsla USB"),
3293 DLT_CHOICE(EBHSCR, "Elektrobit High Speed Capture and Replay (EBHSCR)"),
3294 DLT_CHOICE(VPP_DISPATCH, "VPP graph dispatch tracer"),
3295 DLT_CHOICE(DSA_TAG_BRCM, "Broadcom tag"),
3296 DLT_CHOICE(DSA_TAG_BRCM_PREPEND, "Broadcom tag (prepended)"),
3297 DLT_CHOICE(IEEE802_15_4_TAP, "IEEE 802.15.4 with pseudo-header"),
3298 DLT_CHOICE(DSA_TAG_DSA, "Marvell DSA"),
3299 DLT_CHOICE(DSA_TAG_EDSA, "Marvell EDSA"),
3300 DLT_CHOICE(ELEE, "ELEE lawful intercept packets"),
3301 DLT_CHOICE(Z_WAVE_SERIAL, "Z-Wave serial frames between host and chip"),
3302 DLT_CHOICE(USB_2_0, "USB 2.0/1.1/1.0 as transmitted over the cable"),
3303 DLT_CHOICE(ATSC_ALP, "ATSC Link-Layer Protocol packets"),
3304 DLT_CHOICE_SENTINEL
3305 };
3306
3307 int
3308 pcap_datalink_name_to_val(const char *name)
3309 {
3310 int i;
3311
3312 for (i = 0; dlt_choices[i].name != NULL; i++) {
3313 if (pcap_strcasecmp(dlt_choices[i].name, name) == 0)
3314 return (dlt_choices[i].dlt);
3315 }
3316 return (-1);
3317 }
3318
3319 const char *
3320 pcap_datalink_val_to_name(int dlt)
3321 {
3322 int i;
3323
3324 for (i = 0; dlt_choices[i].name != NULL; i++) {
3325 if (dlt_choices[i].dlt == dlt)
3326 return (dlt_choices[i].name);
3327 }
3328 return (NULL);
3329 }
3330
3331 const char *
3332 pcap_datalink_val_to_description(int dlt)
3333 {
3334 int i;
3335
3336 for (i = 0; dlt_choices[i].name != NULL; i++) {
3337 if (dlt_choices[i].dlt == dlt)
3338 return (dlt_choices[i].description);
3339 }
3340 return (NULL);
3341 }
3342
3343 const char *
3344 pcap_datalink_val_to_description_or_dlt(int dlt)
3345 {
3346 static char unkbuf[40];
3347 const char *description;
3348
3349 description = pcap_datalink_val_to_description(dlt);
3350 if (description != NULL) {
3351 return description;
3352 } else {
3353 (void)snprintf(unkbuf, sizeof(unkbuf), "DLT %u", dlt);
3354 return unkbuf;
3355 }
3356 }
3357
3358 struct tstamp_type_choice {
3359 const char *name;
3360 const char *description;
3361 int type;
3362 };
3363
3364 static struct tstamp_type_choice tstamp_type_choices[] = {
3365 { "host", "Host", PCAP_TSTAMP_HOST },
3366 { "host_lowprec", "Host, low precision", PCAP_TSTAMP_HOST_LOWPREC },
3367 { "host_hiprec", "Host, high precision", PCAP_TSTAMP_HOST_HIPREC },
3368 { "adapter", "Adapter", PCAP_TSTAMP_ADAPTER },
3369 { "adapter_unsynced", "Adapter, not synced with system time", PCAP_TSTAMP_ADAPTER_UNSYNCED },
3370 { "host_hiprec_unsynced", "Host, high precision, not synced with system time", PCAP_TSTAMP_HOST_HIPREC_UNSYNCED },
3371 { NULL, NULL, 0 }
3372 };
3373
3374 int
3375 pcap_tstamp_type_name_to_val(const char *name)
3376 {
3377 int i;
3378
3379 for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
3380 if (pcap_strcasecmp(tstamp_type_choices[i].name, name) == 0)
3381 return (tstamp_type_choices[i].type);
3382 }
3383 return (PCAP_ERROR);
3384 }
3385
3386 const char *
3387 pcap_tstamp_type_val_to_name(int tstamp_type)
3388 {
3389 int i;
3390
3391 for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
3392 if (tstamp_type_choices[i].type == tstamp_type)
3393 return (tstamp_type_choices[i].name);
3394 }
3395 return (NULL);
3396 }
3397
3398 const char *
3399 pcap_tstamp_type_val_to_description(int tstamp_type)
3400 {
3401 int i;
3402
3403 for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
3404 if (tstamp_type_choices[i].type == tstamp_type)
3405 return (tstamp_type_choices[i].description);
3406 }
3407 return (NULL);
3408 }
3409
3410 int
3411 pcap_snapshot(pcap_t *p)
3412 {
3413 if (!p->activated)
3414 return (PCAP_ERROR_NOT_ACTIVATED);
3415 return (p->snapshot);
3416 }
3417
3418 int
3419 pcap_is_swapped(pcap_t *p)
3420 {
3421 if (!p->activated)
3422 return (PCAP_ERROR_NOT_ACTIVATED);
3423 return (p->swapped);
3424 }
3425
3426 int
3427 pcap_major_version(pcap_t *p)
3428 {
3429 if (!p->activated)
3430 return (PCAP_ERROR_NOT_ACTIVATED);
3431 return (p->version_major);
3432 }
3433
3434 int
3435 pcap_minor_version(pcap_t *p)
3436 {
3437 if (!p->activated)
3438 return (PCAP_ERROR_NOT_ACTIVATED);
3439 return (p->version_minor);
3440 }
3441
3442 int
3443 pcap_bufsize(pcap_t *p)
3444 {
3445 if (!p->activated)
3446 return (PCAP_ERROR_NOT_ACTIVATED);
3447 return (p->bufsize);
3448 }
3449
3450 FILE *
3451 pcap_file(pcap_t *p)
3452 {
3453 return (p->rfile);
3454 }
3455
3456 #ifdef _WIN32
3457 int
3458 pcap_fileno(pcap_t *p)
3459 {
3460 if (p->handle != INVALID_HANDLE_VALUE) {
3461 /*
3462 * This is a bogus and now-deprecated API; we
3463 * squelch the narrowing warning for the cast
3464 * from HANDLE to DWORD. If Windows programmmers
3465 * need to get at the HANDLE for a pcap_t, *if*
3466 * there is one, they should request such a
3467 * routine (and be prepared for it to return
3468 * INVALID_HANDLE_VALUE).
3469 */
3470 DIAG_OFF_NARROWING
3471 return ((int)(DWORD)p->handle);
3472 DIAG_ON_NARROWING
3473 } else
3474 return (PCAP_ERROR);
3475 }
3476 #else /* _WIN32 */
3477 int
3478 pcap_fileno(pcap_t *p)
3479 {
3480 return (p->fd);
3481 }
3482 #endif /* _WIN32 */
3483
3484 #if !defined(_WIN32) && !defined(MSDOS)
3485 int
3486 pcap_get_selectable_fd(pcap_t *p)
3487 {
3488 return (p->selectable_fd);
3489 }
3490
3491 const struct timeval *
3492 pcap_get_required_select_timeout(pcap_t *p)
3493 {
3494 return (p->required_select_timeout);
3495 }
3496 #endif
3497
3498 void
3499 pcap_perror(pcap_t *p, const char *prefix)
3500 {
3501 fprintf(stderr, "%s: %s\n", prefix, p->errbuf);
3502 }
3503
3504 char *
3505 pcap_geterr(pcap_t *p)
3506 {
3507 return (p->errbuf);
3508 }
3509
3510 int
3511 pcap_getnonblock(pcap_t *p, char *errbuf)
3512 {
3513 int ret;
3514
3515 ret = p->getnonblock_op(p);
3516 if (ret == -1) {
3517 /*
3518 * The get nonblock operation sets p->errbuf; this
3519 * function *shouldn't* have had a separate errbuf
3520 * argument, as it didn't need one, but I goofed
3521 * when adding it.
3522 *
3523 * We copy the error message to errbuf, so callers
3524 * can find it in either place.
3525 */
3526 pcap_strlcpy(errbuf, p->errbuf, PCAP_ERRBUF_SIZE);
3527 }
3528 return (ret);
3529 }
3530
3531 /*
3532 * Get the current non-blocking mode setting, under the assumption that
3533 * it's just the standard POSIX non-blocking flag.
3534 */
3535 #if !defined(_WIN32) && !defined(MSDOS)
3536 int
3537 pcap_getnonblock_fd(pcap_t *p)
3538 {
3539 int fdflags;
3540
3541 fdflags = fcntl(p->fd, F_GETFL, 0);
3542 if (fdflags == -1) {
3543 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
3544 errno, "F_GETFL");
3545 return (-1);
3546 }
3547 if (fdflags & O_NONBLOCK)
3548 return (1);
3549 else
3550 return (0);
3551 }
3552 #endif
3553
3554 int
3555 pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf)
3556 {
3557 int ret;
3558
3559 ret = p->setnonblock_op(p, nonblock);
3560 if (ret == -1) {
3561 /*
3562 * The set nonblock operation sets p->errbuf; this
3563 * function *shouldn't* have had a separate errbuf
3564 * argument, as it didn't need one, but I goofed
3565 * when adding it.
3566 *
3567 * We copy the error message to errbuf, so callers
3568 * can find it in either place.
3569 */
3570 pcap_strlcpy(errbuf, p->errbuf, PCAP_ERRBUF_SIZE);
3571 }
3572 return (ret);
3573 }
3574
3575 #if !defined(_WIN32) && !defined(MSDOS)
3576 /*
3577 * Set non-blocking mode, under the assumption that it's just the
3578 * standard POSIX non-blocking flag. (This can be called by the
3579 * per-platform non-blocking-mode routine if that routine also
3580 * needs to do some additional work.)
3581 */
3582 int
3583 pcap_setnonblock_fd(pcap_t *p, int nonblock)
3584 {
3585 int fdflags;
3586
3587 fdflags = fcntl(p->fd, F_GETFL, 0);
3588 if (fdflags == -1) {
3589 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
3590 errno, "F_GETFL");
3591 return (-1);
3592 }
3593 if (nonblock)
3594 fdflags |= O_NONBLOCK;
3595 else
3596 fdflags &= ~O_NONBLOCK;
3597 if (fcntl(p->fd, F_SETFL, fdflags) == -1) {
3598 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
3599 errno, "F_SETFL");
3600 return (-1);
3601 }
3602 return (0);
3603 }
3604 #endif
3605
3606 /*
3607 * Generate error strings for PCAP_ERROR_ and PCAP_WARNING_ values.
3608 */
3609 const char *
3610 pcap_statustostr(int errnum)
3611 {
3612 static char ebuf[15+10+1];
3613
3614 switch (errnum) {
3615
3616 case PCAP_WARNING:
3617 return("Generic warning");
3618
3619 case PCAP_WARNING_TSTAMP_TYPE_NOTSUP:
3620 return ("That type of time stamp is not supported by that device");
3621
3622 case PCAP_WARNING_PROMISC_NOTSUP:
3623 return ("That device doesn't support promiscuous mode");
3624
3625 case PCAP_ERROR:
3626 return("Generic error");
3627
3628 case PCAP_ERROR_BREAK:
3629 return("Loop terminated by pcap_breakloop");
3630
3631 case PCAP_ERROR_NOT_ACTIVATED:
3632 return("The pcap_t has not been activated");
3633
3634 case PCAP_ERROR_ACTIVATED:
3635 return ("The setting can't be changed after the pcap_t is activated");
3636
3637 case PCAP_ERROR_NO_SUCH_DEVICE:
3638 return ("No such device exists");
3639
3640 case PCAP_ERROR_RFMON_NOTSUP:
3641 return ("That device doesn't support monitor mode");
3642
3643 case PCAP_ERROR_NOT_RFMON:
3644 return ("That operation is supported only in monitor mode");
3645
3646 case PCAP_ERROR_PERM_DENIED:
3647 return ("You don't have permission to capture on that device");
3648
3649 case PCAP_ERROR_IFACE_NOT_UP:
3650 return ("That device is not up");
3651
3652 case PCAP_ERROR_CANTSET_TSTAMP_TYPE:
3653 return ("That device doesn't support setting the time stamp type");
3654
3655 case PCAP_ERROR_PROMISC_PERM_DENIED:
3656 return ("You don't have permission to capture in promiscuous mode on that device");
3657
3658 case PCAP_ERROR_TSTAMP_PRECISION_NOTSUP:
3659 return ("That device doesn't support that time stamp precision");
3660 }
3661 (void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum);
3662 return(ebuf);
3663 }
3664
3665 /*
3666 * Not all systems have strerror().
3667 */
3668 const char *
3669 pcap_strerror(int errnum)
3670 {
3671 #ifdef HAVE_STRERROR
3672 #ifdef _WIN32
3673 static char errbuf[PCAP_ERRBUF_SIZE];
3674 errno_t err = strerror_s(errbuf, PCAP_ERRBUF_SIZE, errnum);
3675
3676 if (err != 0) /* err = 0 if successful */
3677 pcap_strlcpy(errbuf, "strerror_s() error", PCAP_ERRBUF_SIZE);
3678 return (errbuf);
3679 #else
3680 return (strerror(errnum));
3681 #endif /* _WIN32 */
3682 #else
3683 extern int sys_nerr;
3684 extern const char *const sys_errlist[];
3685 static char errbuf[PCAP_ERRBUF_SIZE];
3686
3687 if ((unsigned int)errnum < sys_nerr)
3688 return ((char *)sys_errlist[errnum]);
3689 (void)snprintf(errbuf, sizeof errbuf, "Unknown error: %d", errnum);
3690 return (errbuf);
3691 #endif
3692 }
3693
3694 int
3695 pcap_setfilter(pcap_t *p, struct bpf_program *fp)
3696 {
3697 return (p->setfilter_op(p, fp));
3698 }
3699
3700 /*
3701 * Set direction flag, which controls whether we accept only incoming
3702 * packets, only outgoing packets, or both.
3703 * Note that, depending on the platform, some or all direction arguments
3704 * might not be supported.
3705 */
3706 int
3707 pcap_setdirection(pcap_t *p, pcap_direction_t d)
3708 {
3709 if (p->setdirection_op == NULL) {
3710 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3711 "Setting direction is not supported on this device");
3712 return (-1);
3713 } else {
3714 switch (d) {
3715
3716 case PCAP_D_IN:
3717 case PCAP_D_OUT:
3718 case PCAP_D_INOUT:
3719 /*
3720 * Valid direction.
3721 */
3722 return (p->setdirection_op(p, d));
3723
3724 default:
3725 /*
3726 * Invalid direction.
3727 */
3728 snprintf(p->errbuf, sizeof(p->errbuf),
3729 "Invalid direction");
3730 return (-1);
3731 }
3732 }
3733 }
3734
3735 int
3736 pcap_stats(pcap_t *p, struct pcap_stat *ps)
3737 {
3738 return (p->stats_op(p, ps));
3739 }
3740
3741 #ifdef _WIN32
3742 struct pcap_stat *
3743 pcap_stats_ex(pcap_t *p, int *pcap_stat_size)
3744 {
3745 return (p->stats_ex_op(p, pcap_stat_size));
3746 }
3747
3748 int
3749 pcap_setbuff(pcap_t *p, int dim)
3750 {
3751 return (p->setbuff_op(p, dim));
3752 }
3753
3754 int
3755 pcap_setmode(pcap_t *p, int mode)
3756 {
3757 return (p->setmode_op(p, mode));
3758 }
3759
3760 int
3761 pcap_setmintocopy(pcap_t *p, int size)
3762 {
3763 return (p->setmintocopy_op(p, size));
3764 }
3765
3766 HANDLE
3767 pcap_getevent(pcap_t *p)
3768 {
3769 return (p->getevent_op(p));
3770 }
3771
3772 int
3773 pcap_oid_get_request(pcap_t *p, bpf_u_int32 oid, void *data, size_t *lenp)
3774 {
3775 return (p->oid_get_request_op(p, oid, data, lenp));
3776 }
3777
3778 int
3779 pcap_oid_set_request(pcap_t *p, bpf_u_int32 oid, const void *data, size_t *lenp)
3780 {
3781 return (p->oid_set_request_op(p, oid, data, lenp));
3782 }
3783
3784 pcap_send_queue *
3785 pcap_sendqueue_alloc(u_int memsize)
3786 {
3787 pcap_send_queue *tqueue;
3788
3789 /* Allocate the queue */
3790 tqueue = (pcap_send_queue *)malloc(sizeof(pcap_send_queue));
3791 if (tqueue == NULL){
3792 return (NULL);
3793 }
3794
3795 /* Allocate the buffer */
3796 tqueue->buffer = (char *)malloc(memsize);
3797 if (tqueue->buffer == NULL) {
3798 free(tqueue);
3799 return (NULL);
3800 }
3801
3802 tqueue->maxlen = memsize;
3803 tqueue->len = 0;
3804
3805 return (tqueue);
3806 }
3807
3808 void
3809 pcap_sendqueue_destroy(pcap_send_queue *queue)
3810 {
3811 free(queue->buffer);
3812 free(queue);
3813 }
3814
3815 int
3816 pcap_sendqueue_queue(pcap_send_queue *queue, const struct pcap_pkthdr *pkt_header, const u_char *pkt_data)
3817 {
3818 if (queue->len + sizeof(struct pcap_pkthdr) + pkt_header->caplen > queue->maxlen){
3819 return (-1);
3820 }
3821
3822 /* Copy the pcap_pkthdr header*/
3823 memcpy(queue->buffer + queue->len, pkt_header, sizeof(struct pcap_pkthdr));
3824 queue->len += sizeof(struct pcap_pkthdr);
3825
3826 /* copy the packet */
3827 memcpy(queue->buffer + queue->len, pkt_data, pkt_header->caplen);
3828 queue->len += pkt_header->caplen;
3829
3830 return (0);
3831 }
3832
3833 u_int
3834 pcap_sendqueue_transmit(pcap_t *p, pcap_send_queue *queue, int sync)
3835 {
3836 return (p->sendqueue_transmit_op(p, queue, sync));
3837 }
3838
3839 int
3840 pcap_setuserbuffer(pcap_t *p, int size)
3841 {
3842 return (p->setuserbuffer_op(p, size));
3843 }
3844
3845 int
3846 pcap_live_dump(pcap_t *p, char *filename, int maxsize, int maxpacks)
3847 {
3848 return (p->live_dump_op(p, filename, maxsize, maxpacks));
3849 }
3850
3851 int
3852 pcap_live_dump_ended(pcap_t *p, int sync)
3853 {
3854 return (p->live_dump_ended_op(p, sync));
3855 }
3856
3857 PAirpcapHandle
3858 pcap_get_airpcap_handle(pcap_t *p)
3859 {
3860 PAirpcapHandle handle;
3861
3862 handle = p->get_airpcap_handle_op(p);
3863 if (handle == NULL) {
3864 (void)snprintf(p->errbuf, sizeof(p->errbuf),
3865 "This isn't an AirPcap device");
3866 }
3867 return (handle);
3868 }
3869 #endif
3870
3871 /*
3872 * On some platforms, we need to clean up promiscuous or monitor mode
3873 * when we close a device - and we want that to happen even if the
3874 * application just exits without explicitl closing devices.
3875 * On those platforms, we need to register a "close all the pcaps"
3876 * routine to be called when we exit, and need to maintain a list of
3877 * pcaps that need to be closed to clean up modes.
3878 *
3879 * XXX - not thread-safe.
3880 */
3881
3882 /*
3883 * List of pcaps on which we've done something that needs to be
3884 * cleaned up.
3885 * If there are any such pcaps, we arrange to call "pcap_close_all()"
3886 * when we exit, and have it close all of them.
3887 */
3888 static struct pcap *pcaps_to_close;
3889
3890 /*
3891 * TRUE if we've already called "atexit()" to cause "pcap_close_all()" to
3892 * be called on exit.
3893 */
3894 static int did_atexit;
3895
3896 static void
3897 pcap_close_all(void)
3898 {
3899 struct pcap *handle;
3900
3901 while ((handle = pcaps_to_close) != NULL) {
3902 pcap_close(handle);
3903
3904 /*
3905 * If a pcap module adds a pcap_t to the "close all"
3906 * list by calling pcap_add_to_pcaps_to_close(), it
3907 * must have a cleanup routine that removes it from the
3908 * list, by calling pcap_remove_from_pcaps_to_close(),
3909 * and must make that cleanup routine the cleanup_op
3910 * for the pcap_t.
3911 *
3912 * That means that, after pcap_close() - which calls
3913 * the cleanup_op for the pcap_t - the pcap_t must
3914 * have been removed from the list, so pcaps_to_close
3915 * must not be equal to handle.
3916 *
3917 * We check for that, and abort if handle is still
3918 * at the head of the list, to prevent infinite loops.
3919 */
3920 if (pcaps_to_close == handle)
3921 abort();
3922 }
3923 }
3924
3925 int
3926 pcap_do_addexit(pcap_t *p)
3927 {
3928 /*
3929 * If we haven't already done so, arrange to have
3930 * "pcap_close_all()" called when we exit.
3931 */
3932 if (!did_atexit) {
3933 if (atexit(pcap_close_all) != 0) {
3934 /*
3935 * "atexit()" failed; let our caller know.
3936 */
3937 pcap_strlcpy(p->errbuf, "atexit failed", PCAP_ERRBUF_SIZE);
3938 return (0);
3939 }
3940 did_atexit = 1;
3941 }
3942 return (1);
3943 }
3944
3945 void
3946 pcap_add_to_pcaps_to_close(pcap_t *p)
3947 {
3948 p->next = pcaps_to_close;
3949 pcaps_to_close = p;
3950 }
3951
3952 void
3953 pcap_remove_from_pcaps_to_close(pcap_t *p)
3954 {
3955 pcap_t *pc, *prevpc;
3956
3957 for (pc = pcaps_to_close, prevpc = NULL; pc != NULL;
3958 prevpc = pc, pc = pc->next) {
3959 if (pc == p) {
3960 /*
3961 * Found it. Remove it from the list.
3962 */
3963 if (prevpc == NULL) {
3964 /*
3965 * It was at the head of the list.
3966 */
3967 pcaps_to_close = pc->next;
3968 } else {
3969 /*
3970 * It was in the middle of the list.
3971 */
3972 prevpc->next = pc->next;
3973 }
3974 break;
3975 }
3976 }
3977 }
3978
3979 void
3980 pcap_breakloop_common(pcap_t *p)
3981 {
3982 p->break_loop = 1;
3983 }
3984
3985
3986 void
3987 pcap_cleanup_live_common(pcap_t *p)
3988 {
3989 if (p->buffer != NULL) {
3990 free(p->buffer);
3991 p->buffer = NULL;
3992 }
3993 if (p->dlt_list != NULL) {
3994 free(p->dlt_list);
3995 p->dlt_list = NULL;
3996 p->dlt_count = 0;
3997 }
3998 if (p->tstamp_type_list != NULL) {
3999 free(p->tstamp_type_list);
4000 p->tstamp_type_list = NULL;
4001 p->tstamp_type_count = 0;
4002 }
4003 if (p->tstamp_precision_list != NULL) {
4004 free(p->tstamp_precision_list);
4005 p->tstamp_precision_list = NULL;
4006 p->tstamp_precision_count = 0;
4007 }
4008 pcap_freecode(&p->fcode);
4009 #if !defined(_WIN32) && !defined(MSDOS)
4010 if (p->fd >= 0) {
4011 close(p->fd);
4012 p->fd = -1;
4013 }
4014 p->selectable_fd = -1;
4015 #endif
4016 }
4017
4018 /*
4019 * API compatible with WinPcap's "send a packet" routine - returns -1
4020 * on error, 0 otherwise.
4021 *
4022 * XXX - what if we get a short write?
4023 */
4024 int
4025 pcap_sendpacket(pcap_t *p, const u_char *buf, int size)
4026 {
4027 if (size <= 0) {
4028 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
4029 errno, "The number of bytes to be sent must be positive");
4030 return (PCAP_ERROR);
4031 }
4032
4033 if (p->inject_op(p, buf, size) == -1)
4034 return (-1);
4035 return (0);
4036 }
4037
4038 /*
4039 * API compatible with OpenBSD's "send a packet" routine - returns -1 on
4040 * error, number of bytes written otherwise.
4041 */
4042 int
4043 pcap_inject(pcap_t *p, const void *buf, size_t size)
4044 {
4045 /*
4046 * We return the number of bytes written, so the number of
4047 * bytes to write must fit in an int.
4048 */
4049 if (size > INT_MAX) {
4050 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
4051 errno, "More than %d bytes cannot be injected", INT_MAX);
4052 return (PCAP_ERROR);
4053 }
4054
4055 if (size == 0) {
4056 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
4057 errno, "The number of bytes to be injected must not be zero");
4058 return (PCAP_ERROR);
4059 }
4060
4061 return (p->inject_op(p, buf, (int)size));
4062 }
4063
4064 void
4065 pcap_close(pcap_t *p)
4066 {
4067 if (p->opt.device != NULL)
4068 free(p->opt.device);
4069 p->cleanup_op(p);
4070 free(p);
4071 }
4072
4073 /*
4074 * Helpers for safely loding code at run time.
4075 * Currently Windows-only.
4076 */
4077 #ifdef _WIN32
4078 //
4079 // This wrapper around loadlibrary appends the system folder (usually
4080 // C:\Windows\System32) to the relative path of the DLL, so that the DLL
4081 // is always loaded from an absolute path (it's no longer possible to
4082 // load modules from the application folder).
4083 // This solves the DLL Hijacking issue discovered in August 2010:
4084 //
4085 // https://blog.rapid7.com/2010/08/23/exploiting-dll-hijacking-flaws/
4086 // https://blog.rapid7.com/2010/08/23/application-dll-load-hijacking/
4087 // (the purported Rapid7 blog post link in the first of those two links
4088 // is broken; the second of those links works.)
4089 //
4090 // If any links there are broken from all the content shuffling Rapid&
4091 // did, see archived versions of the posts at their original homes, at
4092 //
4093 // https://web.archive.org/web/20110122175058/http://blog.metasploit.com/2010/08/exploiting-dll-hijacking-flaws.html
4094 // https://web.archive.org/web/20100828112111/http://blog.rapid7.com/?p=5325
4095 //
4096 pcap_code_handle_t
4097 pcap_load_code(const char *name)
4098 {
4099 /*
4100 * XXX - should this work in UTF-16LE rather than in the local
4101 * ANSI code page?
4102 */
4103 CHAR path[MAX_PATH];
4104 CHAR fullFileName[MAX_PATH];
4105 UINT res;
4106 HMODULE hModule = NULL;
4107
4108 do
4109 {
4110 res = GetSystemDirectoryA(path, MAX_PATH);
4111
4112 if (res == 0) {
4113 //
4114 // some bad failure occurred;
4115 //
4116 break;
4117 }
4118
4119 if (res > MAX_PATH) {
4120 //
4121 // the buffer was not big enough
4122 //
4123 SetLastError(ERROR_INSUFFICIENT_BUFFER);
4124 break;
4125 }
4126
4127 if (res + 1 + strlen(name) + 1 < MAX_PATH) {
4128 memcpy(fullFileName, path, res * sizeof(TCHAR));
4129 fullFileName[res] = '\\';
4130 memcpy(&fullFileName[res + 1], name, (strlen(name) + 1) * sizeof(TCHAR));
4131
4132 hModule = LoadLibraryA(fullFileName);
4133 } else
4134 SetLastError(ERROR_INSUFFICIENT_BUFFER);
4135
4136 } while(FALSE);
4137
4138 return hModule;
4139 }
4140
4141 pcap_funcptr_t
4142 pcap_find_function(pcap_code_handle_t code, const char *func)
4143 {
4144 return (GetProcAddress(code, func));
4145 }
4146 #endif
4147
4148 /*
4149 * Given a BPF program, a pcap_pkthdr structure for a packet, and the raw
4150 * data for the packet, check whether the packet passes the filter.
4151 * Returns the return value of the filter program, which will be zero if
4152 * the packet doesn't pass and non-zero if the packet does pass.
4153 */
4154 int
4155 pcap_offline_filter(const struct bpf_program *fp, const struct pcap_pkthdr *h,
4156 const u_char *pkt)
4157 {
4158 const struct bpf_insn *fcode = fp->bf_insns;
4159
4160 if (fcode != NULL)
4161 return (pcap_filter(fcode, pkt, h->len, h->caplen));
4162 else
4163 return (0);
4164 }
4165
4166 static int
4167 pcap_can_set_rfmon_dead(pcap_t *p)
4168 {
4169 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4170 "Rfmon mode doesn't apply on a pcap_open_dead pcap_t");
4171 return (PCAP_ERROR);
4172 }
4173
4174 static int
4175 pcap_read_dead(pcap_t *p, int cnt _U_, pcap_handler callback _U_,
4176 u_char *user _U_)
4177 {
4178 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4179 "Packets aren't available from a pcap_open_dead pcap_t");
4180 return (-1);
4181 }
4182
4183 static int
4184 pcap_inject_dead(pcap_t *p, const void *buf _U_, int size _U_)
4185 {
4186 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4187 "Packets can't be sent on a pcap_open_dead pcap_t");
4188 return (-1);
4189 }
4190
4191 static int
4192 pcap_setfilter_dead(pcap_t *p, struct bpf_program *fp _U_)
4193 {
4194 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4195 "A filter cannot be set on a pcap_open_dead pcap_t");
4196 return (-1);
4197 }
4198
4199 static int
4200 pcap_setdirection_dead(pcap_t *p, pcap_direction_t d _U_)
4201 {
4202 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4203 "The packet direction cannot be set on a pcap_open_dead pcap_t");
4204 return (-1);
4205 }
4206
4207 static int
4208 pcap_set_datalink_dead(pcap_t *p, int dlt _U_)
4209 {
4210 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4211 "The link-layer header type cannot be set on a pcap_open_dead pcap_t");
4212 return (-1);
4213 }
4214
4215 static int
4216 pcap_getnonblock_dead(pcap_t *p)
4217 {
4218 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4219 "A pcap_open_dead pcap_t does not have a non-blocking mode setting");
4220 return (-1);
4221 }
4222
4223 static int
4224 pcap_setnonblock_dead(pcap_t *p, int nonblock _U_)
4225 {
4226 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4227 "A pcap_open_dead pcap_t does not have a non-blocking mode setting");
4228 return (-1);
4229 }
4230
4231 static int
4232 pcap_stats_dead(pcap_t *p, struct pcap_stat *ps _U_)
4233 {
4234 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4235 "Statistics aren't available from a pcap_open_dead pcap_t");
4236 return (-1);
4237 }
4238
4239 #ifdef _WIN32
4240 static struct pcap_stat *
4241 pcap_stats_ex_dead(pcap_t *p, int *pcap_stat_size _U_)
4242 {
4243 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4244 "Statistics aren't available from a pcap_open_dead pcap_t");
4245 return (NULL);
4246 }
4247
4248 static int
4249 pcap_setbuff_dead(pcap_t *p, int dim _U_)
4250 {
4251 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4252 "The kernel buffer size cannot be set on a pcap_open_dead pcap_t");
4253 return (-1);
4254 }
4255
4256 static int
4257 pcap_setmode_dead(pcap_t *p, int mode _U_)
4258 {
4259 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4260 "impossible to set mode on a pcap_open_dead pcap_t");
4261 return (-1);
4262 }
4263
4264 static int
4265 pcap_setmintocopy_dead(pcap_t *p, int size _U_)
4266 {
4267 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4268 "The mintocopy parameter cannot be set on a pcap_open_dead pcap_t");
4269 return (-1);
4270 }
4271
4272 static HANDLE
4273 pcap_getevent_dead(pcap_t *p)
4274 {
4275 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4276 "A pcap_open_dead pcap_t has no event handle");
4277 return (INVALID_HANDLE_VALUE);
4278 }
4279
4280 static int
4281 pcap_oid_get_request_dead(pcap_t *p, bpf_u_int32 oid _U_, void *data _U_,
4282 size_t *lenp _U_)
4283 {
4284 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4285 "An OID get request cannot be performed on a pcap_open_dead pcap_t");
4286 return (PCAP_ERROR);
4287 }
4288
4289 static int
4290 pcap_oid_set_request_dead(pcap_t *p, bpf_u_int32 oid _U_, const void *data _U_,
4291 size_t *lenp _U_)
4292 {
4293 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4294 "An OID set request cannot be performed on a pcap_open_dead pcap_t");
4295 return (PCAP_ERROR);
4296 }
4297
4298 static u_int
4299 pcap_sendqueue_transmit_dead(pcap_t *p, pcap_send_queue *queue _U_,
4300 int sync _U_)
4301 {
4302 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4303 "Packets cannot be transmitted on a pcap_open_dead pcap_t");
4304 return (0);
4305 }
4306
4307 static int
4308 pcap_setuserbuffer_dead(pcap_t *p, int size _U_)
4309 {
4310 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4311 "The user buffer cannot be set on a pcap_open_dead pcap_t");
4312 return (-1);
4313 }
4314
4315 static int
4316 pcap_live_dump_dead(pcap_t *p, char *filename _U_, int maxsize _U_,
4317 int maxpacks _U_)
4318 {
4319 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4320 "Live packet dumping cannot be performed on a pcap_open_dead pcap_t");
4321 return (-1);
4322 }
4323
4324 static int
4325 pcap_live_dump_ended_dead(pcap_t *p, int sync _U_)
4326 {
4327 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4328 "Live packet dumping cannot be performed on a pcap_open_dead pcap_t");
4329 return (-1);
4330 }
4331
4332 static PAirpcapHandle
4333 pcap_get_airpcap_handle_dead(pcap_t *p _U_)
4334 {
4335 return (NULL);
4336 }
4337 #endif /* _WIN32 */
4338
4339 static void
4340 pcap_cleanup_dead(pcap_t *p _U_)
4341 {
4342 /* Nothing to do. */
4343 }
4344
4345 pcap_t *
4346 pcap_open_dead_with_tstamp_precision(int linktype, int snaplen, u_int precision)
4347 {
4348 pcap_t *p;
4349
4350 switch (precision) {
4351
4352 case PCAP_TSTAMP_PRECISION_MICRO:
4353 case PCAP_TSTAMP_PRECISION_NANO:
4354 break;
4355
4356 default:
4357 /*
4358 * This doesn't really matter, but we don't have any way
4359 * to report particular errors, so the only failure we
4360 * should have is a memory allocation failure. Just
4361 * pick microsecond precision.
4362 */
4363 precision = PCAP_TSTAMP_PRECISION_MICRO;
4364 break;
4365 }
4366 p = malloc(sizeof(*p));
4367 if (p == NULL)
4368 return NULL;
4369 memset (p, 0, sizeof(*p));
4370 p->snapshot = snaplen;
4371 p->linktype = linktype;
4372 p->opt.tstamp_precision = precision;
4373 p->can_set_rfmon_op = pcap_can_set_rfmon_dead;
4374 p->read_op = pcap_read_dead;
4375 p->inject_op = pcap_inject_dead;
4376 p->setfilter_op = pcap_setfilter_dead;
4377 p->setdirection_op = pcap_setdirection_dead;
4378 p->set_datalink_op = pcap_set_datalink_dead;
4379 p->getnonblock_op = pcap_getnonblock_dead;
4380 p->setnonblock_op = pcap_setnonblock_dead;
4381 p->stats_op = pcap_stats_dead;
4382 #ifdef _WIN32
4383 p->stats_ex_op = pcap_stats_ex_dead;
4384 p->setbuff_op = pcap_setbuff_dead;
4385 p->setmode_op = pcap_setmode_dead;
4386 p->setmintocopy_op = pcap_setmintocopy_dead;
4387 p->getevent_op = pcap_getevent_dead;
4388 p->oid_get_request_op = pcap_oid_get_request_dead;
4389 p->oid_set_request_op = pcap_oid_set_request_dead;
4390 p->sendqueue_transmit_op = pcap_sendqueue_transmit_dead;
4391 p->setuserbuffer_op = pcap_setuserbuffer_dead;
4392 p->live_dump_op = pcap_live_dump_dead;
4393 p->live_dump_ended_op = pcap_live_dump_ended_dead;
4394 p->get_airpcap_handle_op = pcap_get_airpcap_handle_dead;
4395 #endif
4396 p->cleanup_op = pcap_cleanup_dead;
4397
4398 /*
4399 * A "dead" pcap_t never requires special BPF code generation.
4400 */
4401 p->bpf_codegen_flags = 0;
4402
4403 p->activated = 1;
4404 return (p);
4405 }
4406
4407 pcap_t *
4408 pcap_open_dead(int linktype, int snaplen)
4409 {
4410 return (pcap_open_dead_with_tstamp_precision(linktype, snaplen,
4411 PCAP_TSTAMP_PRECISION_MICRO));
4412 }
4413
4414 #ifdef YYDEBUG
4415 /*
4416 * Set the internal "debug printout" flag for the filter expression parser.
4417 * The code to print that stuff is present only if YYDEBUG is defined, so
4418 * the flag, and the routine to set it, are defined only if YYDEBUG is
4419 * defined.
4420 *
4421 * This is intended for libpcap developers, not for general use.
4422 * If you want to set these in a program, you'll have to declare this
4423 * routine yourself, with the appropriate DLL import attribute on Windows;
4424 * it's not declared in any header file, and won't be declared in any
4425 * header file provided by libpcap.
4426 */
4427 PCAP_API void pcap_set_parser_debug(int value);
4428
4429 PCAP_API_DEF void
4430 pcap_set_parser_debug(int value)
4431 {
4432 pcap_debug = value;
4433 }
4434 #endif
4435